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Title: The Broadway windowing system
Slug: broadway
## Using GTK with Broadway
The GDK Broadway backend provides support for displaying GTK applications in
a web browser, using HTML5 and web sockets.
To run your application in this way, select the Broadway backend by setting
`GDK_BACKEND=broadway`. Then you can make your application appear in a web
browser by pointing it at `http://127.0.0.1:8080`. Note that you need to
enable web sockets in your web browser.
You can choose a different port from the default 8080 by setting the
`BROADWAY_DISPLAY` environment variable to the port that you want to use.
It is also possible to use multiple GTK applications in the same web browser
window, by using the Broadway server, `gtk4-broadwayd`, that ships with GTK.
To start the Broadway server use:
```
gtk4-broadwayd :5
```
Then point your web browser at `http://127.0.0.1:8085`.
Once the Broadway server is running, you can start your applications like
this:
```
GDK_BACKEND=broadway BROADWAY_DISPLAY=:5 gtk4-demo
```
## Broadway-specific environment variables
### `BROADWAY_DISPLAY`
Specifies the Broadway display number. The default display is 0.
The display number determines the port to use when connecting to a Broadway
application via the following formula:
```
port = 8080 + display
```
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