parameter is excluded, and it triggers only on successful connection._
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
Note2: For private windows, [[on OPEN]] only triggers when opening a new private window from a incoming private message.
_See also [[on CLOSE]]._
_Haltable using ^_
*Parameters*
<level> - The [[User Access Level]] for the event to trigger.
<?|@|=|!|*> - The [[Matchtarget]] to listen to.
<matchtext> - The [[Matchtext]] to listen to.
<commands< - 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