how to capturing a desktop application and streaming it on a web app in realtime?

I've been given a problem that I need some assistance from the SO community as I have no idea how to get a solution for my problem.

I have a project that needs to capture a desktop application in real time and stream them to users who can access the feed one they log into a web based application.

The streaming application needs to be able to capture the application only and not the entire desktop and be able to stream into a player that is hosted on the web applicaiton. Similar to something that you would get from GotoWebinar or WebEx session.

I've looked at Flash Media S开发者_开发百科erver but not sure if that would be suitable for my needs.

I suppose what ways are there to be able to achieve me goal? Would Flash Media server help or are there other technologies out there that would help in this senario? I have a limited budget so the cheaper the solution the better.

I'm looking at developing the web app in PHP as that's the language I have most exposure to, however if I need to I am willing to develop the app in anything.

Cheers

if you have a limited budget, you can try Red5 - Open Source Flash Server Red5 - Open Source Flash Server for server side. As for the client side, you can try software from Camtasia Camtasia, i remember it allow you to chose which application to record.