# $EPIC: on_window_command.txt,v 1.2 2006/08/19 02:36:28 sthalik Exp $
on [<modes>]window_command [<serial#>] [-|^]<match> { <action> }
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.
| $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.
ON WINDOW_COMMAND first appeared in EPIC4-1.2.0.