This program has been obsoleted by xserver-xorg-video-intel 2.99.
This is a reimplementation of hybrid-windump with the opposite use-case: doing all rendering using the integrated intel card and using the additional card just to get more outputs (e.g. a triple-head with ThinkPad T420). As such, it uses the DAMAGE extension to avoid unnecessary redraws and the RECORD extension to capture mouse movements, which are translated to mouse movements on the destination X server.
For this to work correctly, an additional virtual Xinerama screen must be available. To get one, see my virtual CRTC for intel patch.