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+# W30 User Guide
+
+## W30 File Format
+
+- a **W30** app is a **ZIP-file** with the extension `.w30`
+- the ZIP-file must contain at least the file `index.html`
+- if the W30 app is started, `index.html` is opened in a restricted webview
+  that allow accessing resources only from the ZIP-file
+
+
+## W30 API
+
+W30 apps can do anything that is allowed in webviews -
+html, css, images, canvas, javascript and so on.
+
+There are some additional APIs available once `deltachat.js` is included
+(the file will be provided by the concrete implementations,
+no need to add `deltachat.js` to your ZIP-file):
+
+```
+<script src="deltachat.js></script>
+```
+
+### sendUpdate()
+
+```
+window.deltachat.sendUpdate(descr, payload);
+```
+
+W30 apps are usually shared in a chat and run independently on each peer.
+To get a shared state, the peers use `sendUpdate()` to send updates to each other.
+
+- `descr`: short, human-readable description what this update is about.
+  this is shown eg. as a fallback text in an email program.
+- `payload`: any javascript primitive, array or object.
+
+All peers, including the sending one,
+will receive the update by the callback given to `setUpdateListener()`.
+
+### setUpdateListener()
+
+```
+window.deltachat.setUpdateListener((update) => {});
+```
+
+With `setUpdateListener()` you define a callback that receives the updates
+sent by `sendUpdate()`.
+
+- `update`: passed to the callback on updates.
+- `update.payload`: equals the payload given to `sendUpdate()`
+
+The callback is called for updates sent by you or other peers.
+
+
+### getAllUpdates()
+
+```
+payloads = window.deltachat.getAllUpdates()
+```
+
+In case your W30 was just started,
+you may want to reconstruct the state from the last run -
+and also incorporate updates that may have arrived while the app was not running.
+
+- `payloads`: the function returns all previous updates in an array, 
+  eg. `[{payload: "foo"},{payload: "bar"}]`
+  if `deltachat.sendUpdate("foo"); deltachat.sendUpdate("bar");` was called on the last run.
+
+### selfAddr()
+
+```
+addr = window.deltachat.selfAddr()
+```
+
+Returns the peer's own address.
+This is esp. useful if you want to differ between different peers -
+just send the address along with the payload,
+and, if needed, compare the payload addresses against selfAddr() later on.
+
+
+## W30 Example
+
+The following example shows an input field and  every input is show on all peers.
+
+```html
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8"/>
+    <script src="deltachat.js"></script>
+  </head>
+  <body>
+    <input id="input" type="text"/>
+    <a href="" onclick="sendMsg(); return false;">Send</a>
+    <p id="output"></p>
+    <script>
+    
+      function sendMsg() {
+        msg = document.getElementById("input").value;
+        window.deltachat.sendUpdate('Someone typed "'+msg+'".', msg);
+      }
+    
+      function receiveUpdate(update) {
+        document.getElementById('output').innerHTML += update.payload + "<br>";
+      }
+    
+      window.deltachat.setUpdateListener(receiveUpdate);
+
+    </script>
+  </body>
+</html>
+```
+
+For a more advanved example, see https://github.com/r10s/w30-poll/ .
+
+
+## Closing Remarks
+
+- older devices might not have the newest js features in their webview,
+  you may want to transpile your code down to an older js version eg. with https://babeljs.io
+- there are tons of ideas for enhancements of the API and the file format,
+  eg. in the future, we will may define icon- and manifest-files,
+  allow to aggregate the state or add metadata.
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