>Is there a way to prevent starting a second time the same application (.exe) ?
>
>thank you

Jacques,

There are a number of ways to do this:

1. Set up the application as a DDE server, and try to access it on start up. If you can, it's running. If it times out, it isn't. Vlad Tatavu has a file here that uses this method. Unfortunately, I don't know exact location and file number.
2. Iterate through the existing top-level windows looking for the title bar. My Is_Run32 (Is a Windows Application Running?) does this. It's in the download section in Win32 and Other APIs.
3. Create a mutex. I described this technique in the Nov. 1998 issue of FoxPro Advisor. The article is on-line at www.advisor.com
4. Create an event. Ed Rauh uses this technique. It's FILE#9807, in the Win32 and Other APIs section (number 33 or 34 or the list).