Hi,
I'm guessing Desktop sharing is still not available in FMIS 3.0.
I wanted to know what is the best way to achieve this.
Also another question was is it possible for a user to upload and control a
ppt or a pdf file so that others can view it as the speaker talks through the
slides
Thanks in advance

Unfortunately, no... screensharing is still not available in the general
release of the Flashplayer (it's only available to Adobe connect).

The way I handle document sharing is to first convert the document to .swf
with one page (or slide) on each frame, load the .swf to each client via HTTP,
and then use a shared object to sync data about the current frame number.