This is an OpenGL "gyroscope" hack for ThinkPads using hdaps,
written in OCaml:
http://www.cs.cmu.edu/~ecc/gyro.tar.gz
When you tilt the ThinkPad, it transforms the display so that it stays
approximately level. You can't actually use the display while it's
running, because it uses a static screenshot.
--
Eric Cooper e c c @ c m u . e d u