Hi Matt,

Yes, it's a good idea to make sure that main.exe is closed before attempting to rename it. You can do that by using FOPEN(,12) or code from http://www.berezniker.com/content/pages/visual-foxpro/check-if-exe-running-and-optionally-terminate-it

>Sergey, I'm refactoring this today and I wonder if you could give me your opinion on something.
>
>In the pseudocode scenario below, I'm concerned about the timing, when the Main.exe automatically closes upon receiving an update file from the server, and the Loader.exe fires up again and tries to call the Main.exe. I suppose it'd be best to put a loop in the loader that checks to see if the main.exe is open and waits a certain time for it to close. Do you see any problems with doing it this way?
>
>Thanks,
>-m@
>
>

>[Loader.exe ]
>If Update File Exists
>  rename main.exe to main.old
>  rename main.updt to main.exe
>endif 
>ShellExec("main.exe")
>Loade.exe exits
>

>
>

>[Main.exe]
>*--Normal execution...
>An updt file is received from the server
>Prompt user about restart, wait 10 seconds or for user to click OK. 
>ShellExec("Loader.exe")
>QUIT is issued
>main.exe closes
>