Noob herel, have question

[95240SE]

I just bought a 95 240sx SE this weekend after many months of searching for the right one. Its not in bad shape. almost 82k on the engine. My quesition is that while i was exploring the interior i notice there is a button for the sunroof that is label something like (asc) or (acs). Is it supposed to do anything because when i pressed it nothing happened. If anybody knows what it does tell me.