Hi Hawthourne,
to add to what 3run said, you might want to check this thread too
http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Number=445062&page=1, and for example take txesmi's solution.
Basically the main function you are looking for is vec_to_angle . So lets say you have your vector point you want your object to you look at (e.g. at the Player), the function looks something like this:
vec_to_angle(object.pan, player.x); //this lets object look at player