Like a plugin for old version of Miranda: http://dmitry.ch/#Whiteboard
Windows ME used to be able to turn Draw into a whiteboard by mirroring on IPV6, I seem to recall. One machine could declare themself host. Similar code at all? A plugin whiteboard sure would be a nice utility. Surely some art-streamer has gone multi-remote parallel access by now, home, server, or cloud hosted. Maybe not, but that sounds most versatile.
Implementing a graphics app like gimp with an xml wrapped event queue everyone shares would do the job.
He may write that, but where are located source codes? I see it nowhere on his website. I never saw repository with sources of Whiteboard plugin. If you know where I can download them, tell me. Otherwise you must contact original author to give them to you (and then tell me).
An author's page remarks at the very bottom
"All pojects are under GPL"
Could you ask author for source code?