Syphon is an open source Mac OS X technology that allows applications to share frames - full frame rate video or stills - with one another in realtime” - via http://syphon.v002.info
CoGe has native Syphon support. In the Syphon model, a 'server' is an application that sends frames and a 'client' receives frames. CoGe can be a server: ClipSynths, the Master Mixer and Layer Groups all pass the rendered frame to Syphon clients. CoGe also can be a client - you may playback frames provided by a Syphon server in ClipSynths and you are also able to use them in Effect and Mixer modules.