Collaborative tools

[hooligan]

Hello,

I doubt there is an extentions for this but I thought I would ask anyway and maybe someone might know of a different open source solution that can integrate with Joomla.

I am looking for some sort of solution that will let me share a common "desktop" (for lack of a better word) that several INVITED/REGISTERED folks can see all at once. I guess what I am refering to is some sort of a whiteboard. 

What I'm looking to do is discuss certain documents, charts, maps, etc with colleagues and be able to "point to/mark them up" in real time so that everyone can follow along.

Can anyone point me in the right direction?

Thanks,
Mike