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I read about OpenLaszlo and full screen mode at the Laszlo forums. So I thought to publish a very small demo of how to create a solo app, that uses this feature. Here is a demo:

It’s pretty easy, as you can access the AS objects directly with OpenLaszlo:

<canvas>
<script>
Stage.scaleMode = "noScale";
Stage.align = "TL";
function toggleFullScreen() {
if (Stage["displayState"] == "normal") {
Stage["displayState"] = "fullScreen";
} else {
Stage["displayState"] = "normal";
}
}
</script>
<button text="Toggle Fullscreen" onclick="toggleFullScreen()" x="${parent.width/2-this.width/2}" y="${parent.height/2-this.height/2}"/>
</canvas>

Deploy it as a solo app and integrate it into your website like this:

<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,18,0" width="200" height="200">
<param name="allowFullScreen" value="true" />
<param name="movie" value="fullscreen.swf" />
<embed src="fullscreen.swf" allowFullScreen="true" width="200" height="200" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" />
</object>

There it is. Your very own full screen app
There are some restrictions (like for keyboard input) and I haven’t tried to use it in a server deployment, yet. So feel free to experiment …

This method is outdated. With 4.4 there’s a built-in method. Have a look at:
http://openfuture.rajubitter.com/2009/07/01/openlaszlo-44-released-video-components-improved-full-screen-support-for-swfx/