# $EPIC: on_window_command.txt,v 1.2 2006/08/19 02:36:28 sthalik Exp $
======Synopsis:======
[[on]] [<modes>]window_command [<serial#>] [-|^]<match> { <action> }

======Description:======
This hook is triggered each time a /[[WINDOW]] command is executed, to inform
you of any changes to the current operative window.  This can be useful 
if you need to prep a window before commands are executed on it.

Changing things about a window from this hook can be dangerous and lead to
a crash.  This would not be a bug in epic.  Use [[DEFER]] to be completely 
safe.

======Parameters:======
|$0	The |operative window refnum before the command was executed|
|$1	The |operative window refnum after the command was executed.  |
If the command failed, then this is -1.

======History:======
[[ON]] [[on WINDOW_COMMAND|WINDOW_COMMAND]] first appeared in EPIC4-1.2.0.