diff --git a/web/lib/editor.js b/web/lib/editor.js
index 64b8cd5..2448958 100644
--- a/web/lib/editor.js
+++ b/web/lib/editor.js
@@ -352,6 +352,45 @@
 		},
 	];
 
+	const VALID_HASH = /^[0-9]{1,2}$/;
+
+	function getHash() {
+		const full = window.location.hash;
+		return full ? full.substr(1) : '';
+	}
+
+	class HashSlotNav {
+		constructor(changeListener = () => null) {
+			this.hash = getHash();
+			window.addEventListener('hashchange', () => {
+				// Only trigger listener if change wasn't caused by us
+				if(getHash() !== this.hash) {
+					changeListener();
+				}
+			});
+		}
+
+		maxSlots() {
+			// Capacity of localStorage is limited
+			// So avoid allowing too many documents
+			// (also acts as a fail-safe if anything gets loop-ey)
+			return 100;
+		}
+
+		getSlot() {
+			const hash = getHash();
+			if(VALID_HASH.test(hash)) {
+				return Number(hash);
+			}
+			return null;
+		}
+
+		setSlot(v) {
+			this.hash = v.toFixed(0);
+			window.location.hash = this.hash;
+		}
+	}
+
 	function make(value, document) {
 		if(typeof value === 'string') {
 			return document.createTextNode(value);
@@ -1203,6 +1242,10 @@
 		get() {
 			return this.value;
 		}
+
+		remove() {
+			this.value = '';
+		}
 	}
 
 	const DELAY_AGENTCHANGE = 500;
@@ -1843,10 +1886,268 @@
 				return '';
 			}
 		}
+
+		remove() {
+			try {
+				window.localStorage.removeItem(this.id);
+			} catch(e) {
+				// Ignore
+			}
+		}
+	}
+
+	class MultiLocalStorage {
+		constructor(slotManager, slotStorage) {
+			this.slotManager = slotManager;
+			this.slotStorage = slotStorage;
+			this.slot = this.slotManager.getSlot();
+			this.value = this.get();
+			this.originalValue = this.value;
+			this.loadTime = Date.now();
+			this.internalStorageListener = this.internalStorageListener.bind(this);
+
+			window.addEventListener('storage', this.internalStorageListener);
+			this.checkSlot();
+		}
+
+		getCurrentValue() {
+			// If the page just loaded, clone the original document
+			// (works around glitches with CodeMirror when duplicating tabs)
+			if(Date.now() < this.loadTime + 500) {
+				return this.originalValue;
+			}
+			return this.value;
+		}
+
+		key() {
+			return this.slotStorage.getSlotKey(this.slot);
+		}
+
+		checkSlot() {
+			const key = this.key();
+			window.localStorage.removeItem(`chk-${key}`);
+			window.localStorage.removeItem(`res-${key}`);
+			window.localStorage.removeItem(`ack-${key}`);
+
+			// Check if any other tabs are viewing the same document
+			window.localStorage.setItem(`chk-${key}`, '1');
+		}
+
+		cloneSlot() {
+			const slotLimit = this.slotManager.maxSlots();
+			const newSlot = this.slotStorage.nextAvailableSlot(slotLimit);
+			if(!newSlot) {
+				return;
+			}
+
+			const value = this.getCurrentValue();
+			this.slotStorage.set(newSlot, value);
+			this.slot = newSlot;
+			this.slotManager.setSlot(newSlot);
+
+			// Force editor to load corrected content if needed
+			if(value !== this.value) {
+				document.location.reload();
+			}
+		}
+
+		// eslint-disable-next-line complexity
+		internalStorageListener({ storageArea, key, newValue }) {
+			if(storageArea !== window.localStorage) {
+				return;
+			}
+
+			const ownKey = this.key();
+			if(key === ownKey && newValue !== this.value) {
+				if(newValue === null) {
+					// Somebody deleted our document; put it back
+					// (a nicer explanation for the deleter may be nice, but later)
+					window.localStorage.setItem(ownKey, this.value);
+				}
+				// Another tab unexpectedly changed a value we own
+				// Remind them that we own the document
+				window.localStorage.removeItem(`res-${ownKey}`);
+				window.localStorage.setItem(`res-${ownKey}`, '1');
+			}
+
+			if(key === `chk-${ownKey}` && newValue) {
+				// Another tab is checking if our slot is in use; reply yes
+				window.localStorage.setItem(`res-${ownKey}`, '1');
+			}
+
+			if(key === `res-${ownKey}` && newValue) {
+				// Another tab owns our slot; clone the document
+				window.localStorage.removeItem(`chk-${ownKey}`);
+				window.localStorage.removeItem(`res-${ownKey}`);
+				window.localStorage.setItem(`ack-${ownKey}`, '1');
+				this.cloneSlot();
+			}
+
+			if(key === `ack-${ownKey}` && newValue) {
+				// Another tab has acknowledged us as the owner of the document
+				// Restore 'correct' value in case it was clobbered accidentally
+				window.localStorage.removeItem(`ack-${ownKey}`, '1');
+				window.localStorage.setItem(ownKey, this.value);
+			}
+		}
+
+		set(value) {
+			this.value = value;
+			this.slotStorage.set(this.slot, value);
+		}
+
+		get() {
+			return this.slotStorage.get(this.slot);
+		}
+
+		remove() {
+			this.slotStorage.remove(this.slot);
+		}
+
+		close() {
+			window.removeEventListener('storage', this.internalStorageListener);
+		}
 	}
 
 	var SequenceDiagram = window.SequenceDiagram;
 
+	const VALID_SLOT_KEY = /^s[0-9]+$/;
+
+	class SlotLocalStores {
+		getSlotKey(slot) {
+			return `s${slot}`;
+		}
+
+		getAllSlots() {
+			const result = [];
+			try {
+				for(const key in window.localStorage) {
+					if(VALID_SLOT_KEY.test(key)) {
+						result.push(Number(key.substr(1)));
+					}
+				}
+			} catch(e) {
+				// Ignore
+			}
+			return result;
+		}
+
+		nextAvailableSlot(limit = Number.MAX_SAFE_INTEGER) {
+			try {
+				for(let i = 1; i < limit; ++ i) {
+					if(window.localStorage.getItem(this.getSlotKey(i)) === null) {
+						return i;
+					}
+				}
+				return null;
+			} catch(e) {
+				return null;
+			}
+		}
+
+		set(slot, value) {
+			try {
+				window.localStorage.setItem(this.getSlotKey(slot), value);
+			} catch(ignore) {
+				// Ignore
+			}
+		}
+
+		get(slot) {
+			try {
+				return window.localStorage.getItem(this.getSlotKey(slot)) || '';
+			} catch(e) {
+				return '';
+			}
+		}
+
+		remove(slot) {
+			try {
+				window.localStorage.removeItem(this.getSlotKey(slot));
+			} catch(ignore) {
+				// Ignore
+			}
+		}
+	}
+
+	var requestSlot = (hashNav, slotStorage) => {
+		if(hashNav.getSlot() !== null) {
+			return Promise.resolve();
+		}
+
+		const slots = slotStorage.getAllSlots().sort((a, b) => (a - b));
+		if(!slots.length) {
+			hashNav.setSlot(1);
+			return Promise.resolve();
+		}
+
+		const dom = new DOMWrapper(window.document);
+		const container = dom.el('div').setClass('pick-document')
+			.add(dom.el('h1').text('Available documents on this computer:'))
+			.add(dom.el('p').text('(right-click to delete)'))
+			.attach(document.body);
+
+		function remove(slot) {
+			// eslint-disable-next-line no-alert
+			if(window.confirm('Delete this document?')) {
+				slotStorage.remove(slot);
+				window.location.reload();
+			}
+		}
+
+		const diagram = new SequenceDiagram();
+		return new Promise((resolve) => {
+			const diagrams = slots.map((slot) => {
+				const code = slotStorage.get(slot);
+
+				const holdInner = dom.el('div')
+					.attr('title', code.trim());
+
+				const hold = dom.el('a')
+					.attr('href', `#${slot}`)
+					.setClass('pick-document-item')
+					.add(holdInner)
+					.fastClick()
+					.on('click', (e) => {
+						e.preventDefault();
+						resolve(slot);
+					})
+					.on('contextmenu', (e) => {
+						e.preventDefault();
+						remove(slot);
+					})
+					.attach(container);
+
+				return diagram.clone({
+					code,
+					container: holdInner.element,
+					render: false,
+				}).on('error', (sd, e) => {
+					window.console.warn('Failed to render preview', e);
+					hold.attr('class', 'pick-document-item broken');
+					holdInner.text(code);
+				});
+			});
+
+			try {
+				diagram.renderAll(diagrams);
+			} catch(ignore) {
+				// Ignore
+			}
+
+			if(slots.length < hashNav.maxSlots()) {
+				dom.el('div')
+					.setClass('pick-document-item new')
+					.add(dom.el('div').attr('title', 'New document'))
+					.on('click', () => resolve(slotStorage.nextAvailableSlot()))
+					.attach(container);
+			}
+		}).then((slot) => {
+			container.detach();
+			hashNav.setSlot(slot);
+		});
+	};
+
 	const require = window.requirejs;
 
 	const paths = {};
@@ -1903,6 +2204,16 @@
 		'terminators box\n'
 	);
 
+	function migrateOldDocument(slotStorage) {
+		const oldStorage = new LocalStorage('src');
+		const doc = oldStorage.get();
+		if(doc) {
+			const newSlot = slotStorage.nextAvailableSlot();
+			slotStorage.set(newSlot, doc);
+			oldStorage.remove();
+		}
+	}
+
 	window.addEventListener('load', () => {
 		const loader = window.document.getElementById('loader');
 		const [nav] = loader.getElementsByTagName('nav');
@@ -1917,19 +2228,28 @@
 			});
 		}
 
-		const storage = new LocalStorage('src');
+		const slotStorage = new SlotLocalStores();
+		migrateOldDocument(slotStorage);
 
-		const ui = new Interface({
-			defaultCode,
-			library: ComponentsLibrary,
-			links,
-			require,
-			sequenceDiagram: new SequenceDiagram(),
-			storage,
-			touchUI: ('ontouchstart' in window),
+		const hashNav = new HashSlotNav(() => {
+			// If the slot is changed by the user, reload to force a document load
+			window.location.reload();
 		});
+
 		loader.parentNode.removeChild(loader);
-		ui.build(window.document.body);
+
+		requestSlot(hashNav, slotStorage).then(() => {
+			const ui = new Interface({
+				defaultCode,
+				library: ComponentsLibrary,
+				links,
+				require,
+				sequenceDiagram: new SequenceDiagram(),
+				storage: new MultiLocalStorage(hashNav, slotStorage),
+				touchUI: ('ontouchstart' in window),
+			});
+			ui.build(window.document.body);
+		});
 	});
 
 }());
diff --git a/web/lib/editor.min.js b/web/lib/editor.min.js
index cae9a93..792897a 100644
--- a/web/lib/editor.min.js
+++ b/web/lib/editor.min.js
@@ -1 +1 @@
-!function(){"use strict";function e(e){return null===e?null:e.element?e.element:e}function t(e){return e.length>0&&"\n"!==e.charAt(e.length-1)?e+"\n":e}function i(e,t){let i=0,s=0;for(;;){const n=e.indexOf("\n",i)+1;if(t<n||0===n)return{ch:t-i,line:s};i=n,++s}}function s(e,{from:t,to:i}){return!(e.line<t.line||e.line===t.line&&e.ch<t.ch||e.line>i.line||e.line===i.line&&e.ch>i.ch)}function n(e,t){const i=e.toString(),s=i.indexOf(".");return-1===s||i.length-s-1<=t?i:e.toFixed(t)}function r(e=null){return null!==e&&!Number.isNaN(e)}var o=[{code:"{Agent1} -> {Agent2}: {Message}",title:"Simple arrow (synchronous)"},{code:"{Agent1} --\x3e {Agent2}: {Message}",title:"Arrow with dotted line (response)"},{code:"{Agent1} ->> {Agent2}: {Message}",title:"Open arrow (asynchronous)"},{code:"{Agent1} -x {Agent2}: {Message}",title:"Lost message"},{code:"{Agent1} ~> {Agent2}: {Message}",title:"Wavy line"},{code:"{Agent1} -> {Agent1}: {Message}",title:"Self-connection"},{code:"{Agent1} -> ...{id}\n...{id} -> {Agent2}: {Message}",preview:"begin A, B\nA -> ...x\n...x -> B: Message",title:"Asynchronous message"},{code:"* -> {Agent1}: {Message}",title:"Found message"},{code:"{Agent1} -> {Agent2}\n& {Agent1} -> {Agent3}: {Broadcast}",title:"Broadcast message"},{code:"{Agent1} -> +{Agent2}: {Request}\n{Agent1} <-- -{Agent2}: {Response}",title:"Request/response pair"},{code:"{Agent1} -> *{Agent2}: {Request}\n{Agent1} <-- !{Agent2}: {Response}",title:"Inline agent creation / destruction"},{code:"{Agent1} -> {Agent2}: {Request}\n{Agent1} <-- {Agent2}: {Response}\nend {Agent2}",preview:"begin A\n::\nA -> B: Request\nA <-- B: Response\nend B",title:"Agent creation / destruction"},{code:'autolabel "[<inc>] <label>"',preview:'autolabel "[<inc>] <label>"\nA -> B: Foo\nA <- B: Bar\nA -> B: Baz',title:"Numbered labels"},{code:"if {Condition1}\n  {Agent1} -> {Agent2}\nelse if {Condition2}\n  {Agent1} -> {Agent2}\nelse\n  {Agent1} -> {Agent2}\nend",preview:"begin A, B\nif Condition1\n  A -> B\nelse if Condition2\n  A -> B\nelse\n  A -> B\nend",title:"Conditional blocks"},{code:"repeat {Condition}\n  {Agent1} -> {Agent2}\nend",preview:"begin A, B\nrepeat Condition\n  A -> B\nend",title:"Repeated block"},{code:"begin reference: {Label} as {Name}\n{Agent1} -> {Name}\nend {Name}",preview:'begin A\nbegin reference: "See 1.3" as myRef\nA -> myRef\nmyRef -> A\nend myRef',title:"Reference"},{code:"begin reference over {Covered}: {Label} as {Name}\n{Agent1} -> {Name}\nend {Name}",preview:'begin A, B, C\nbegin reference over B, C: "See 1.3" as myRef\nA -> myRef\nmyRef -> A\nend myRef',title:"Reference over agents"},{code:"group {Label}\n  {Agent1} -> {Agent2}\nend",preview:"begin A, B\ngroup Label\n  A -> B\nend",title:"Group"},{code:"note over {Agent1}: {Message}",title:"Note over agent"},{code:"note over {Agent1}, {Agent2}: {Message}",title:"Note over multiple agents"},{code:"note left of {Agent1}: {Message}",title:"Note left of agent"},{code:"note right of {Agent1}: {Message}",title:"Note right of agent"},{code:"note between {Agent1}, {Agent2}: {Message}",title:"Note between agents"},{code:"{Agent1} -> {Agent2}\n& note right of {Agent2}: {Message}",title:"Inline note"},{code:"state over {Agent1}: {State}",title:"State over agent"},{code:"[ -> {Agent1}: {Message1}\n{Agent1} -> ]: {Message2}",title:"Arrows to/from the sides"},{code:"{Agent1} -~ ]: {Message1}\n{Agent1} <-~ ]: {Message2}",title:"Fading arrows"},{code:"text right: {Message}",preview:'A -> B\nsimultaneously:\ntext right: "Message\\non the\\nside"',title:"Text beside the diagram"},{code:"divider space with height 10: {message}",preview:"begin A, B, C, D, E, F\ndivider space with height 30: message",title:"Vertical space divider"},{code:"divider line with height 10: {message}",preview:"begin A, B, C, D, E, F\ndivider line with height 30: message",title:"Line divider"},{code:"divider delay with height 10: {message}",preview:"begin A, B, C, D, E, F\ndivider delay with height 30: message",title:"Delay divider"},{code:"divider tear with height 10: {message}",preview:"begin A, B, C, D, E, F\ndivider tear with height 30: message",title:"Tear divider"},{code:"title {Title}",preview:"headers box\ntitle Title\nA -> B",title:"Title"},{code:"**{text}**",preview:"A -> B: **bold**",title:"Bold markdown"},{code:"_{text}_",preview:"A -> B: _italic_",title:"Italic markdown"},{code:"~{text}~",preview:"A -> B: ~strikeout~",title:"Strikeout markdown"},{code:"<u>{text}</u>",preview:"A -> B: <u>underline</u>",title:"Underline markdown"},{code:"<o>{text}</o>",preview:"A -> B: <o>overline</o>",title:"Overline markdown"},{code:"<sup>{text}</sup>",preview:"A -> B: super<sup>script</sup>",title:"Superscript markdown"},{code:"<sub>{text}</sub>",preview:"A -> B: sub<sub>script</sub>",title:"Subscript markdown"},{code:"`{text}`",preview:"A -> B: `mono`",title:"Monospace markdown"},{code:"<red>{text}</red>",preview:"A -> B: <red>red</red>",title:"Red markdown"},{code:"<highlight>{text}</highlight>",preview:"A -> B: <highlight>highlight</highlight>",title:"Highlight markdown"},{code:"{Agent} is red",preview:"headers box\nA is red\nbegin A",title:"Red agent line"},{code:"{Agent} is a person",preview:"headers box\nA is a person\nbegin A",title:"Person indicator"},{code:"{Agent} is a database",preview:"headers box\nA is a database\nbegin A",title:"Database indicator"},{code:"theme monospace",preview:"headers box\ntitle mono\ntheme monospace\nA -> B",title:"Monospace theme"},{code:"theme chunky",preview:"headers box\ntitle chunky\ntheme chunky\nA -> B",title:"Chunky theme"},{code:"theme sketch",preview:"headers box\ntitle sketch\ntheme sketch\nA -> B",title:"Sketch theme"},{code:"terminators cross",preview:"begin A\nterminators cross",title:"Cross terminators"},{code:"terminators fade",preview:"begin A\nterminators fade",title:"Fade terminators"},{code:"terminators bar",preview:"begin A\nterminators bar",title:"Bar terminators"},{code:"terminators box",preview:"begin A\nterminators box",title:"Box terminators"}];class l{constructor(e){this.element=e}addBefore(t=null,i=null){if(null===t)return this;if(Array.isArray(t))for(const e of t)this.addBefore(e,i);else{const s=function(e,t){return"string"==typeof e?t.createTextNode(e):"number"==typeof e?t.createTextNode(e.toString(10)):"object"==typeof e&&e.element?e.element:e}(t,this.element.ownerDocument);this.element.insertBefore(s,e(i))}return this}add(...e){return this.addBefore(e,null)}del(t=null){return null!==t&&this.element.removeChild(e(t)),this}attr(e,t){return this.element.setAttribute(e,t),this}attrs(e){for(const t in e)Object.prototype.hasOwnProperty.call(e,t)&&this.element.setAttribute(t,e[t]);return this}styles(e){for(const t in e)Object.prototype.hasOwnProperty.call(e,t)&&(this.element.style[t]=e[t]);return this}setClass(e){return this.attr("class",e)}addClass(e){const t=this.element.getAttribute("class");if(!t)return this.setClass(e);const 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this.element.parentNode&&this.element.parentNode.removeChild(this.element),this}}class a{constructor(e){if(!e)throw new Error("Missing document!");this.document=e,this.wrap=this.wrap.bind(this),this.el=this.el.bind(this),this.txt=this.txt.bind(this)}wrap(e){return e.element?e:new l(e)}el(e,t=null){let i=null;return i=null===t?this.document.createElement(e):this.document.createElementNS(t,e),new l(i)}txt(e=""){return this.document.createTextNode(e)}}a.WrappedElement=l,a.WrappedElement.prototype.fastClick=function(){const e={x:-1,y:0};return this.on("touchstart",t=>{const[i]=t.touches;e.x=i.pageX,e.y=i.pageY},{passive:!0}).on("touchend",t=>{if(-1===e.x||0!==t.touches.length||1!==t.changedTouches.length)return void(e.x=-1);const[i]=t.changedTouches;Math.abs(e.x-i.pageX)<10&&Math.abs(e.y-i.pageY)<10&&(t.preventDefault(),t.target.click()),e.x=-1})},a.WrappedElement.prototype.split=function(e,t){return this.add(e),function(e,t){const 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Clipboard");this.urlOutput=this.dom.el("input").setClass("output").attr("readonly","readonly").on("focus",()=>{this.urlOutput.select(0,this.urlOutput.element.value.length)});const t=this.dom.el("button").setClass("copy").attr("title","Copy to clipboard").fastClick().on("click",()=>{this.touchUI&&this.urlOutput.styles({display:"block"}),this.urlOutput.focus().select(0,this.urlOutput.element.value.length).element.ownerDocument.execCommand("copy"),t.focus(),this.container.delClass("keyinput"),this.touchUI&&this.urlOutput.styles({display:"none"}),e.styles({display:"block",opacity:1,transition:"none"}),setTimeout(()=>e.styles({opacity:0,transition:"opacity 0.5s linear"}),1e3),setTimeout(()=>e.styles({display:"none"}),1500)});this.urlWidth=this.dom.el("input").attrs({min:0,placeholder:"auto",step:"any",type:"number"}).on("input",()=>{this.urlZoom.val("1"),this._refreshURL()}),this.urlHeight=this.dom.el("input").attrs({min:0,placeholder:"auto",step:"any",type:"number"}).on("input",()=>{this.urlZoom.val("1"),this._refreshURL()}),this.urlZoom=this.dom.el("input").attrs({min:0,step:"any",type:"number",value:1}).on("input",()=>{this.urlWidth.val(""),this.urlHeight.val(""),this._refreshURL()});const i=this.dom.el("div").setClass("config").add(this.dom.el("label").add("width ",this.urlWidth),", ",this.dom.el("label").add("height ",this.urlHeight),this.dom.el("span").setClass("or").add("or"),this.dom.el("label").add("zoom ",this.urlZoom),this.urlOutput,t,e),s=this.dom.el("div").setClass("urlbuilder").styles({display:"none"}).add(this.dom.el("div").setClass("message").add("Loading…"));return this.renderService=new g,function(e){return"undefined"==typeof fetch?Promise.reject(new Error):fetch(e).then(e=>{if(!e.ok)throw new Error(e.statusText);return e})}("render/").then(e=>e.text()).then(e=>{let t=e.trim();t&&!t.startsWith("<")||(t="render/"),this.renderService.setBase(new URL(t,window.location.href).href),s.empty().add(i),this._refreshURL()}).catch(()=>{s.empty().add(this.dom.el("div").setClass("message").add("No online rendering service available."))}),s}_refreshURL(){this.urlOutput.val(this.renderService.getURL(this.code.value(),{height:Number.parseFloat(this.urlHeight.element.value),width:Number.parseFloat(this.urlWidth.element.value),zoom:Number.parseFloat(this.urlZoom.element.value||"1")}))}_showURLBuilder(){this.builderVisible||(this.builderVisible=!0,this.touchUI?this.urlBuilder.styles({bottom:"-210px",display:"block"}):this.urlBuilder.styles({display:"block",height:"0px",padding:"0px",width:this.optsHold.element.clientWidth+"px"}),clearTimeout(this.builderTm),this.builderTm=setTimeout(()=>{this.touchUI?this.urlBuilder.styles({bottom:0}):(this.urlBuilder.styles({height:"150px",padding:"10px",width:"400px"}),this.optsHold.styles({"box-shadow":"10px 10px 25px 12px rgba(0,0,0,0.3)"}))},0),this._refreshURL())}_hideURLBuilder(){this.builderVisible&&(this.builderVisible=!1,this.touchUI?this.urlBuilder.styles({bottom:-this.urlBuilder.element.clientHeight-60+"px"}):(this.urlBuilder.styles({height:"0px",padding:"0px",width:"0px"}),this.optsHold.styles({"box-shadow":"none"})),this.container.delClass("keyinput"),clearTimeout(this.builderTm),this.builderTm=setTimeout(()=>{this.urlBuilder.styles({display:"none"})},200))}buildOptionsDownloads(){return this.downloadPNG=this.dom.el("a").text("Export PNG").attrs({download:"SequenceDiagram.png",href:"#"}).on(["focus","mouseover","mousedown"],this._downloadPNGFocus).on("touchend",this._downloadPNGFocus).on("click",this._downloadPNGClick),this.downloadSVG=this.dom.el("a").text("SVG").attrs({download:"SequenceDiagram.svg",href:"#"}).fastClick().on("click",this._downloadSVGClick),this.downloadURL=this.dom.el("a").text("URL").attrs({href:"#"}).fastClick().on("click",this._downloadURLClick),this.urlBuilder=this.buildURLBuilder(),this.optsHold=this.dom.el("div").setClass("options downloads").add(this.downloadPNG,this.downloadSVG,this.downloadURL,this.urlBuilder),this.optsHold}buildLibrary(e){const t=this.library.map(t=>{const i=this.dom.el("div").attr("title",t.title||t.code),s=this.dom.el("div").setClass("library-item").add(i).fastClick().on("click",()=>this.code.addCodeBlock(t.code)).attach(e);return this.diagram.clone({code:function(e){return"headers fade\nterminators fade\n"+e.replace(/\{Agent([0-9]*)\}/g,(e,t)=>void 0===t?"A":String.fromCharCode("A".charCodeAt(0)+Number(t)-1)).replace(/[{}]/g,"")}(t.preview||t.code),container:i.element,render:!1}).on("error",(e,n)=>{window.console.warn("Failed to render preview",n),s.attr("class","library-item broken"),i.text(t.code)})});try{this.diagram.renderAll(t)}catch(e){}return e}buildCodePane(){const e=this.dom.el("div").setClass("pane-code");return this.code=new m(this.dom,e,{mode:"sequence",require:this.require,value:this.storage.get()||this.defaultCode}),this.code.on("enhance",(e,t)=>{this.diagram.registerCodeMirrorMode(e),t.themes=this.diagram.getThemeNames()}).on("change",()=>this.update(!1)).on("cursorActivity",(e,t)=>{this.diagram.setHighlight(Math.min(e.line,t.line))}).on("focus",()=>this._hideURLBuilder()),e}buildLibPane(){return 0===this.library.length?null:this.dom.el("div").setClass("pane-library").add(this.dom.el("div").setClass("pane-library-scroller").add(this.buildLibrary(this.dom.el("div").setClass("pane-library-inner"))))}buildViewPane(){return this.viewPaneInner=this.dom.el("div").setClass("pane-view-inner").add(this.diagram.dom()).on("touchstart",()=>this._hideURLBuilder(),{passive:!0}).on("mousedown",()=>this._hideURLBuilder()),this.errorMsg=this.dom.el("div").setClass("msg-error"),this.dom.el("div").setClass("pane-view").add(this.dom.el("div").setClass("pane-view-scroller").add(this.viewPaneInner),this.errorMsg)}build(e){this.dom=new h(e.ownerDocument),this.container=this.dom.wrap(e).on("dragover",e=>{e.preventDefault(),function(e,t){if(!e.dataTransfer.items&&0===e.dataTransfer.files.length)return[...e.dataTransfer.types].includes("Files");const i=e.dataTransfer.items||e.dataTransfer.files;return 1===i.length&&i[0].type===t}(e,"image/svg+xml")?(e.dataTransfer.dropEffect="copy",this._showDropStyle()):e.dataTransfer.dropEffect="none"}).on("dragleave",this._hideDropStyle).on("dragend",this._hideDropStyle).on("drop",e=>{e.preventDefault(),this._hideDropStyle();const t=function(e,t){const i=e.dataTransfer.items||e.dataTransfer.files;if(1!==i.length||i[0].type!==t)return null;const[s]=i;return s.getAsFile?s.getAsFile():s}(e,"image/svg+xml");t&&this.loadFile(t)}).on("focusin",()=>this.container.addClass("keyinput")).on("focusout",()=>this.container.delClass("keyinput"));const t=this.buildCodePane(),i=this.buildLibPane(),s=this.buildViewPane(),n=this.links.map(e=>this.dom.el("a").attrs({href:e.href,target:"_blank"}).text(this.touchUI?e.touchLabel:e.label));this.touchUI?(this.buildOptionsDownloads(),this.container.addClass("touch").add(this.dom.el("div").setClass("pane-hold").split([s,t],{direction:"vertical",minSize:[10,10],require:this.require,sizes:[80,20],snapOffset:20}),i.styles({display:"none",top:"100%"}),this.urlBuilder,this.dom.el("div").setClass("optbar").add(...n,this.downloadPNG.text("PNG"),this.downloadSVG.text("SVG"),this.downloadURL.text("URL")))):this.container.add(this.dom.el("div").setClass("pane-hold").split([this.dom.el("div").setClass("pane-side").split([t,i],{direction:"vertical",minSize:[100,5],require:this.require,sizes:[70,30],snapOffset:5}),s],{direction:"horizontal",minSize:[10,10],require:this.require,sizes:[30,70],snapOffset:70}),this.dom.el("div").setClass("options links").add(n),this.buildOptionsDownloads()),"undefined"!=typeof window&&window.addEventListener("keydown",e=>{27===e.keyCode&&this._hideURLBuilder()}),setTimeout(this.update.bind(this),0)}updateMinSize({width:e,height:t}){this.viewPaneInner.styles({minHeight:Math.ceil(t*this.minScale)+"px",minWidth:Math.ceil(e*this.minScale)+"px"})}redrawDebounced(e,t){t<=0?this.redraw(e):(clearTimeout(this.debounced),this.latestSeq=e,this.debounced=setTimeout(()=>this.redraw(e),t))}redraw(e){clearTimeout(this.debounced),this.debounced=null,this.renderedSeq=e,this.diagram.render(e)}markError(e){"object"==typeof e&&e.message?this.errorMsg.text(e.message):this.errorMsg.text(e),this.errorMsg.addClass("error")}markOK(){this.errorMsg.text("").delClass("error")}loadFile(e){return function(e){return new Promise(t=>{const i=new FileReader;i.addEventListener("loadend",()=>{t(i.result)},{once:!0}),i.readAsText(e)})}(e).then(e=>{const t=this.diagram.extractCodeFromSVG(e);t&&(this.code.setValue(t),this.diagram.expandAll({render:!1}),this.update(!0),this.diagram.setHighlight(null))})}update(e=!0){this._hideURLBuilder();const t=this.code.value();this.storage.set(t);let i=null;try{i=this.diagram.process(t)}catch(e){return void this.markError(e)}this.markOK();let s=0;if(!e&&this.renderedSeq){const e=this.renderedSeq;i.agents.length!==e.agents.length?s=w:i.stages.length!==e.stages.length&&(s=v)}this.redrawDebounced(i,s)}forceRender(){this.debounced&&(clearTimeout(this.debounced),this.redraw(this.latestSeq))}updatePNGLink(){return this.forceRender(),!(this.updatingPNG||!this.pngDirty||(this.pngDirty=!1,this.updatingPNG=!0,this.diagram.getPNG({resolution:f}).then(({url:e,latest:t})=>{t&&(this.downloadPNG.attr("href",e),this.updatingPNG=!1)}),0))}_showDropStyle(){this.container.addClass("drop-target")}_hideDropStyle(){this.container.delClass("drop-target")}_downloadPNGFocus(){this.updatePNGLink()}_downloadPNGClick(e){this.updatingPNG?e.preventDefault():this.updatePNGLink()&&e.preventDefault(),this._hideURLBuilder()}_downloadSVGClick(){this.forceRender();const e=this.diagram.getSVGSynchronous();this.downloadSVG.attr("href",e),this._hideURLBuilder()}_downloadURLClick(e){e.preventDefault(),this.builderVisible?this._hideURLBuilder():this._showURLBuilder()}}({defaultCode:'title Labyrinth\n\nBowie -> Goblin: You remind me of the babe\nGoblin -> Bowie: What babe?\nBowie -> Goblin: The babe with the power\nGoblin -> Bowie: What power?\nnote right of Bowie, Goblin: Most people get muddled here!\nBowie -> Goblin: "The power of voodoo"\nGoblin -> Bowie: "Who-do?"\nBowie -> Goblin: You do!\nGoblin -> Bowie: Do what?\nBowie -> Goblin: Remind me of the babe!\n\nBowie -> Audience: Sings\n\nterminators box\n',library:l,links:n,require:k,sequenceDiagram:new y,storage:new class{constructor(e,t){this.slotManager=e,this.slotStorage=t,this.slot=this.slotManager.getSlot(),this.value=this.get(),this.originalValue=this.value,this.loadTime=Date.now(),this.internalStorageListener=this.internalStorageListener.bind(this),window.addEventListener("storage",this.internalStorageListener),this.checkSlot()}getCurrentValue(){return Date.now()<this.loadTime+500?this.originalValue:this.value}key(){return this.slotStorage.getSlotKey(this.slot)}checkSlot(){const e=this.key();window.localStorage.removeItem(`chk-${e}`),window.localStorage.removeItem(`res-${e}`),window.localStorage.removeItem(`ack-${e}`),window.localStorage.setItem(`chk-${e}`,"1")}cloneSlot(){const e=this.slotManager.maxSlots(),t=this.slotStorage.nextAvailableSlot(e);if(!t)return;const i=this.getCurrentValue();this.slotStorage.set(t,i),this.slot=t,this.slotManager.setSlot(t),i!==this.value&&document.location.reload()}internalStorageListener({storageArea:e,key:t,newValue:i}){if(e!==window.localStorage)return;const s=this.key();t===s&&i!==this.value&&(null===i&&window.localStorage.setItem(s,this.value),window.localStorage.removeItem(`res-${s}`),window.localStorage.setItem(`res-${s}`,"1")),t===`chk-${s}`&&i&&window.localStorage.setItem(`res-${s}`,"1"),t===`res-${s}`&&i&&(window.localStorage.removeItem(`chk-${s}`),window.localStorage.removeItem(`res-${s}`),window.localStorage.setItem(`ack-${s}`,"1"),this.cloneSlot()),t===`ack-${s}`&&i&&(window.localStorage.removeItem(`ack-${s}`,"1"),window.localStorage.setItem(s,this.value))}set(e){this.value=e,this.slotStorage.set(this.slot,e)}get(){return this.slotStorage.get(this.slot)}remove(){this.slotStorage.remove(this.slot)}close(){window.removeEventListener("storage",this.internalStorageListener)}}(r,o),touchUI:"ontouchstart"in window}).build(window.document.body)})})}();
\ No newline at end of file
diff --git a/web/scripts/editor.mjs b/web/scripts/editor.mjs
index 84dfc88..f96e97b 100644
--- a/web/scripts/editor.mjs
+++ b/web/scripts/editor.mjs
@@ -1,7 +1,11 @@
 import ComponentsLibrary from './interface/ComponentsLibrary.mjs';
+import HashSlotNav from './slots/HashSlotNav.mjs';
 import Interface from './interface/Interface.mjs';
 import LocalStorage from './storage/LocalStorage.mjs';
+import MultiLocalStorage from './storage/MultiLocalStorage.mjs';
 import SequenceDiagram from '../../scripts/sequence/SequenceDiagram.mjs';
+import SlotLocalStores from './slots/SlotLocalStores.mjs';
+import requestSlot from './slots/requestSlot.mjs';
 import {require} from './requireCDN.mjs';
 
 const defaultCode = (
@@ -23,6 +27,16 @@ const defaultCode = (
 	'terminators box\n'
 );
 
+function migrateOldDocument(slotStorage) {
+	const oldStorage = new LocalStorage('src');
+	const doc = oldStorage.get();
+	if(doc) {
+		const newSlot = slotStorage.nextAvailableSlot();
+		slotStorage.set(newSlot, doc);
+		oldStorage.remove();
+	}
+}
+
 window.addEventListener('load', () => {
 	const loader = window.document.getElementById('loader');
 	const [nav] = loader.getElementsByTagName('nav');
@@ -37,17 +51,26 @@ window.addEventListener('load', () => {
 		});
 	}
 
-	const storage = new LocalStorage('src');
+	const slotStorage = new SlotLocalStores();
+	migrateOldDocument(slotStorage);
 
-	const ui = new Interface({
-		defaultCode,
-		library: ComponentsLibrary,
-		links,
-		require,
-		sequenceDiagram: new SequenceDiagram(),
-		storage,
-		touchUI: ('ontouchstart' in window),
+	const hashNav = new HashSlotNav(() => {
+		// If the slot is changed by the user, reload to force a document load
+		window.location.reload();
 	});
+
 	loader.parentNode.removeChild(loader);
-	ui.build(window.document.body);
+
+	requestSlot(hashNav, slotStorage).then(() => {
+		const ui = new Interface({
+			defaultCode,
+			library: ComponentsLibrary,
+			links,
+			require,
+			sequenceDiagram: new SequenceDiagram(),
+			storage: new MultiLocalStorage(hashNav, slotStorage),
+			touchUI: ('ontouchstart' in window),
+		});
+		ui.build(window.document.body);
+	});
 });
diff --git a/web/scripts/slots/HashSlotNav.mjs b/web/scripts/slots/HashSlotNav.mjs
new file mode 100644
index 0000000..472e478
--- /dev/null
+++ b/web/scripts/slots/HashSlotNav.mjs
@@ -0,0 +1,38 @@
+const VALID_HASH = /^[0-9]{1,2}$/;
+
+function getHash() {
+	const full = window.location.hash;
+	return full ? full.substr(1) : '';
+}
+
+export default class HashSlotNav {
+	constructor(changeListener = () => null) {
+		this.hash = getHash();
+		window.addEventListener('hashchange', () => {
+			// Only trigger listener if change wasn't caused by us
+			if(getHash() !== this.hash) {
+				changeListener();
+			}
+		});
+	}
+
+	maxSlots() {
+		// Capacity of localStorage is limited
+		// So avoid allowing too many documents
+		// (also acts as a fail-safe if anything gets loop-ey)
+		return 100;
+	}
+
+	getSlot() {
+		const hash = getHash();
+		if(VALID_HASH.test(hash)) {
+			return Number(hash);
+		}
+		return null;
+	}
+
+	setSlot(v) {
+		this.hash = v.toFixed(0);
+		window.location.hash = this.hash;
+	}
+}
diff --git a/web/scripts/slots/SlotLocalStores.mjs b/web/scripts/slots/SlotLocalStores.mjs
new file mode 100644
index 0000000..cebf9bc
--- /dev/null
+++ b/web/scripts/slots/SlotLocalStores.mjs
@@ -0,0 +1,58 @@
+const VALID_SLOT_KEY = /^s[0-9]+$/;
+
+export default class SlotLocalStores {
+	getSlotKey(slot) {
+		return `s${slot}`;
+	}
+
+	getAllSlots() {
+		const result = [];
+		try {
+			for(const key in window.localStorage) {
+				if(VALID_SLOT_KEY.test(key)) {
+					result.push(Number(key.substr(1)));
+				}
+			}
+		} catch(e) {
+			// Ignore
+		}
+		return result;
+	}
+
+	nextAvailableSlot(limit = Number.MAX_SAFE_INTEGER) {
+		try {
+			for(let i = 1; i < limit; ++ i) {
+				if(window.localStorage.getItem(this.getSlotKey(i)) === null) {
+					return i;
+				}
+			}
+			return null;
+		} catch(e) {
+			return null;
+		}
+	}
+
+	set(slot, value) {
+		try {
+			window.localStorage.setItem(this.getSlotKey(slot), value);
+		} catch(ignore) {
+			// Ignore
+		}
+	}
+
+	get(slot) {
+		try {
+			return window.localStorage.getItem(this.getSlotKey(slot)) || '';
+		} catch(e) {
+			return '';
+		}
+	}
+
+	remove(slot) {
+		try {
+			window.localStorage.removeItem(this.getSlotKey(slot));
+		} catch(ignore) {
+			// Ignore
+		}
+	}
+}
diff --git a/web/scripts/slots/requestSlot.mjs b/web/scripts/slots/requestSlot.mjs
new file mode 100644
index 0000000..e2d00f5
--- /dev/null
+++ b/web/scripts/slots/requestSlot.mjs
@@ -0,0 +1,80 @@
+import DOMWrapper from '../../../scripts/core/DOMWrapper.mjs';
+import SequenceDiagram from '../../../scripts/sequence/SequenceDiagram.mjs';
+
+export default (hashNav, slotStorage) => {
+	if(hashNav.getSlot() !== null) {
+		return Promise.resolve();
+	}
+
+	const slots = slotStorage.getAllSlots().sort((a, b) => (a - b));
+	if(!slots.length) {
+		hashNav.setSlot(1);
+		return Promise.resolve();
+	}
+
+	const dom = new DOMWrapper(window.document);
+	const container = dom.el('div').setClass('pick-document')
+		.add(dom.el('h1').text('Available documents on this computer:'))
+		.add(dom.el('p').text('(right-click to delete)'))
+		.attach(document.body);
+
+	function remove(slot) {
+		// eslint-disable-next-line no-alert
+		if(window.confirm('Delete this document?')) {
+			slotStorage.remove(slot);
+			window.location.reload();
+		}
+	}
+
+	const diagram = new SequenceDiagram();
+	return new Promise((resolve) => {
+		const diagrams = slots.map((slot) => {
+			const code = slotStorage.get(slot);
+
+			const holdInner = dom.el('div')
+				.attr('title', code.trim());
+
+			const hold = dom.el('a')
+				.attr('href', `#${slot}`)
+				.setClass('pick-document-item')
+				.add(holdInner)
+				.fastClick()
+				.on('click', (e) => {
+					e.preventDefault();
+					resolve(slot);
+				})
+				.on('contextmenu', (e) => {
+					e.preventDefault();
+					remove(slot);
+				})
+				.attach(container);
+
+			return diagram.clone({
+				code,
+				container: holdInner.element,
+				render: false,
+			}).on('error', (sd, e) => {
+				window.console.warn('Failed to render preview', e);
+				hold.attr('class', 'pick-document-item broken');
+				holdInner.text(code);
+			});
+		});
+
+		try {
+			diagram.renderAll(diagrams);
+		} catch(ignore) {
+			// Ignore
+		}
+
+		if(slots.length < hashNav.maxSlots()) {
+			dom.el('div')
+				.setClass('pick-document-item new')
+				.add(dom.el('div').attr('title', 'New document'))
+				.on('click', () => resolve(slotStorage.nextAvailableSlot()))
+				.attach(container);
+		}
+	}).then((slot) => {
+		container.detach();
+		hashNav.setSlot(slot);
+	});
+};
diff --git a/web/scripts/storage/LocalStorage.mjs b/web/scripts/storage/LocalStorage.mjs
index c2a2b37..85474e4 100644
--- a/web/scripts/storage/LocalStorage.mjs
+++ b/web/scripts/storage/LocalStorage.mjs
@@ -18,4 +18,12 @@ export default class LocalStorage {
 			return '';
 		}
 	}
+
+	remove() {
+		try {
+			window.localStorage.removeItem(this.id);
+		} catch(e) {
+			// Ignore
+		}
+	}
 }
diff --git a/web/scripts/storage/MultiLocalStorage.mjs b/web/scripts/storage/MultiLocalStorage.mjs
new file mode 100644
index 0000000..4a59783
--- /dev/null
+++ b/web/scripts/storage/MultiLocalStorage.mjs
@@ -0,0 +1,112 @@
+export default class MultiLocalStorage {
+	constructor(slotManager, slotStorage) {
+		this.slotManager = slotManager;
+		this.slotStorage = slotStorage;
+		this.slot = this.slotManager.getSlot();
+		this.value = this.get();
+		this.originalValue = this.value;
+		this.loadTime = Date.now();
+		this.internalStorageListener = this.internalStorageListener.bind(this);
+
+		window.addEventListener('storage', this.internalStorageListener);
+		this.checkSlot();
+	}
+
+	getCurrentValue() {
+		// If the page just loaded, clone the original document
+		// (works around glitches with CodeMirror when duplicating tabs)
+		if(Date.now() < this.loadTime + 500) {
+			return this.originalValue;
+		}
+		return this.value;
+	}
+
+	key() {
+		return this.slotStorage.getSlotKey(this.slot);
+	}
+
+	checkSlot() {
+		const key = this.key();
+		window.localStorage.removeItem(`chk-${key}`);
+		window.localStorage.removeItem(`res-${key}`);
+		window.localStorage.removeItem(`ack-${key}`);
+
+		// Check if any other tabs are viewing the same document
+		window.localStorage.setItem(`chk-${key}`, '1');
+	}
+
+	cloneSlot() {
+		const slotLimit = this.slotManager.maxSlots();
+		const newSlot = this.slotStorage.nextAvailableSlot(slotLimit);
+		if(!newSlot) {
+			return;
+		}
+
+		const value = this.getCurrentValue();
+		this.slotStorage.set(newSlot, value);
+		this.slot = newSlot;
+		this.slotManager.setSlot(newSlot);
+
+		// Force editor to load corrected content if needed
+		if(value !== this.value) {
+			document.location.reload();
+		}
+	}
+
+	// eslint-disable-next-line complexity
+	internalStorageListener({ storageArea, key, newValue }) {
+		if(storageArea !== window.localStorage) {
+			return;
+		}
+
+		const ownKey = this.key();
+		if(key === ownKey && newValue !== this.value) {
+			if(newValue === null) {
+				// Somebody deleted our document; put it back
+				// (a nicer explanation for the deleter may be nice, but later)
+				window.localStorage.setItem(ownKey, this.value);
+			}
+			// Another tab unexpectedly changed a value we own
+			// Remind them that we own the document
+			window.localStorage.removeItem(`res-${ownKey}`);
+			window.localStorage.setItem(`res-${ownKey}`, '1');
+		}
+
+		if(key === `chk-${ownKey}` && newValue) {
+			// Another tab is checking if our slot is in use; reply yes
+			window.localStorage.setItem(`res-${ownKey}`, '1');
+		}
+
+		if(key === `res-${ownKey}` && newValue) {
+			// Another tab owns our slot; clone the document
+			window.localStorage.removeItem(`chk-${ownKey}`);
+			window.localStorage.removeItem(`res-${ownKey}`);
+			window.localStorage.setItem(`ack-${ownKey}`, '1');
+			this.cloneSlot();
+		}
+
+		if(key === `ack-${ownKey}` && newValue) {
+			// Another tab has acknowledged us as the owner of the document
+			// Restore 'correct' value in case it was clobbered accidentally
+			window.localStorage.removeItem(`ack-${ownKey}`, '1');
+			window.localStorage.setItem(ownKey, this.value);
+		}
+	}
+
+	set(value) {
+		this.value = value;
+		this.slotStorage.set(this.slot, value);
+	}
+
+	get() {
+		return this.slotStorage.get(this.slot);
+	}
+
+	remove() {
+		this.slotStorage.remove(this.slot);
+	}
+
+	close() {
+		window.removeEventListener('storage', this.internalStorageListener);
+	}
+}
diff --git a/web/scripts/storage/VoidStorage.mjs b/web/scripts/storage/VoidStorage.mjs
index 8583f59..30038f9 100644
--- a/web/scripts/storage/VoidStorage.mjs
+++ b/web/scripts/storage/VoidStorage.mjs
@@ -10,4 +10,8 @@ export default class VoidStorage {
 	get() {
 		return this.value;
 	}
+
+	remove() {
+		this.value = '';
+	}
 }
diff --git a/web/styles/editor.css b/web/styles/editor.css
index 9f088eb..f31ea67 100644
--- a/web/styles/editor.css
+++ b/web/styles/editor.css
@@ -508,6 +508,78 @@ svg a:active, svg a:hover {
 	text-align: center;
 }
 
+.pick-document {
+	position: absolute;
+	top: 0;
+	left: 0;
+	right: 0;
+	bottom: 0;
+	overflow: hidden;
+	overflow-y: auto;
+	padding: 20px 30px;
+	text-align: center;
+}
+
+.pick-document h1 {
+	font: 2em sans-serif;
+	margin: 0 0 10px;
+}
+
+.pick-document p {
+	font-size: 0.8em;
+	font-style: italic;
+	margin: 0 0 20px;
+}
+
+.pick-document-item {
+	display: inline-block;
+	width: 200px;
+	height: 200px;
+	margin: 10px;
+	user-select: none;
+}
+
+.pick-document-item > div {
+	width: 200px;
+	height: 200px;
+	border: 2px solid #EEEEEE;
+	background: #FFFFFF;
+	box-sizing: border-box;
+	cursor: pointer;
+	overflow: hidden;
+	transition: transform 0.2s, border-color 0.2s, background 0.2s;
+}
+
+.pick-document-item.broken > div {
+	padding: 5px;
+	font: 6px monospace;
+	white-space: pre;
+}
+
+.pick-document-item svg {
+	width: 100%;
+	height: 100%;
+}
+
+.pick-document-item:hover > div {
+	border-color: #FFCC00;
+	background: #FFFFDD;
+	transform: scale(1.1);
+	z-index: 10;
+}
+
+.pick-document-item.new > div:before {
+	content: '+';
+	line-height: 170px;
+	font-size: 120px;
+	color: #EEEEEE;
+	transition: color 0.2s;
+}
+
+.pick-document-item.new:hover > div:before {
+	color: #FFCC00;
+}
+
 @media print {
 	.drop-target:after {
 		display: none;