Sets you being back. Bans the specified nick from the curent or given channel. Clears the entire scrollback buffer of the current window. Clears all text in all open windows. Opens a dcc window and sends a dcc chat request to nickname.
Forces mIRC to closedown and exit.
Does a finger on a users address. Activates the font selection dialog. Sets channel or user modes. Changes your nickname to whatever you like. Makes you leave all channels you are on.