draw_self(): draws the object's sprite (yes, i didn't use game maker 8.1)
say(str): send a chat message. example: say("noby sucks")
sayConsole(islocal, str): send a console message depending whether islocal is 0 (false) or 1 (true). example: sayConsole(0,"you are not allowed to do that")
islocal: whether the message should be sent or displayed locally.

kill(): self explanatory-- if it isn't then u dont have brain cells
disconnect(): self explanatory too, if it isnt ur a retard
disconnect_reason(str): disconnect the player with a reason. example: disconnect_reason("Kicked")
chat_newline(): makes a new line for chat so that you can use say() or sayConsole() next