_Added in 1.9.0_
*on :OPEN:|=|!|*>::*
Trigger for various events relating to the opening of a window of different types of windows.
Note: If you halt an [[on OPEN]] event triggered by an incoming private message, no [[on TEXT]]/[[on ACTION]] events is triggered
See also [[on CLOSE]].
*Parameters*
- The level for the event to trigger.
|@|=|!|*> - The [[Matchtarget]] to listen to.
- The [[Matchtext]] to listen to.
- The commands to be performed when the event listener's criteria is met.
*Example*
; Print a message when a query window is opened.
on *:OPEN:?:*:echo -ag Opened query window for $nick