[MagneticLlama]

What do you mean by open and close?? Doors? If so, I believe the commands "ent_fire func_door_rotating open" (or close) will get the job done. Though this will open every func_door_rotating in the map. You might also want to try "func_door" (This is for sliding doors)

You can use the ent_fire system to affect only the object you're looking at, but I don't recall how (Server I play at uses a completely different system for playing with entities.)