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+# $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.