All the docs should be in the distro package - did you install them so they would show up in the Flash IDE help panel?
Regarding the whiteboard - that was a last-minute addition to the code that I didn’‘t write. Sean Treadway did that one (http://sean.treadway.info). AFAIK, the code is for transmission of the necessary information to recreate the geometry of a drawing on the other end. Meaning, the code doesn’'t do any drawing itself, just acts as a convenient way to transmit the data in a Message.
To use, you would do something like:
var myMessage = new Message( … );
var wb = new WhiteboardExtension();
// Add a path to the WhiteboardExtension payload in the message
var p = new Path();
p.addSegment( , to: } );
p.serialize( wb );
myMessage.addExtension( wb );
// Now send the message, trace to see the XML
myXMPPConnection.send( myMessage );
// On the other end, take the message, extract the paths from the whiteboard payload
This is an educated guess as to how it works - I haven’'t tried it myself. I know that it does work though, as its used at http://www.scenerum.org.