>I don't want to use :
> WAIT "PLEASE WAIT ..." WINDOW NOWAIT
> because it sometimes disappears before the process ends. So I tried using the > define window/show window command.

I know you don't want to use it...... but I think if you place a NOCLEAR in the WAIT WINDOW and then a WAIT CLEAR when the process is over the window will display through the process. Might help until you get the other ironed out....