i am looking for a training tool where you could supply a realtime image of a desktop to many client, so that they can do software application training.

Does anyone know of anything like this.
should be possible to intergrate this with a forum (Gateway? we hope) and IRC + wiki.

For the windows platform, NetMeeting is a powerful free tool being used by training companies. This application is far more than just a video conferencing tool. With NetMeeting, you can remotely demonstrate applications in real time, control another computer with Remote Desktop Sharing, share applications and allow others to control those applications, chat, share files, use the whiteboard, etc

Clients can also be connected easily through MSN Messenger or ICQ accounts. Many other IM'S now also support Netmeeting.

Features:

http://www.departments.dsu.edu/disted/netmeeting/

A good independant site for Netmeeting info and links is:

http://www.meetingbywire.com/

A site with extra tools for training with Netmeeting: (not free}

http://www.milori.com/ttools/webmeet/netmeeting.asp