Flex Screen Sharing and remote control

I have a webconference prototype, written in flex 3.5 as a web application. Inside this application I need a screen sharing component (sharing and let remote control happen). There should be 3 modes: 1) application sharing (select a window from the desktop) 2) desktop sharing (select a monitor from the pc) 3) part of one monitor (select with a rectangle tool the part of one monitor that should be shared) The screen sharing solution should be able to: * to stream from a pc, mac and linux * capture and compress the selected part of the computer * should go through firewalls and proxies by using http-tunneling * should stream to weborb server or CDN, which then distributes the stream to the visitors * should allow control the presenters desktop, so that visitor can work on the shared stream of the presenter (= remote control). I am only looking for developers, who have already build such a solution.