Pointing the camera at a 3D vector

I know about the llSetCameraAtOffset and llSetCameraEyeOffset commands but is there a way to have the camera point at a specific set of coordinates in the 3D world?

I'm trying to create a lecture theatre and, rather than having each seat/camera scripted individually, am wondering if I can just tell the camera to point to a specific location/object.

Check out http://lslwiki.net/lslwiki/wakka.php?wakka=llSetCameraParams

Note,
CAMERA_FOCUS_LOCKED
and
CAMERA_POSITION_LOCKED

have to be true, or your users camera will just snap back.