>Hi All,
>I have one EXE which is on my server. i have four client machine.
>
>But i want to run this exe by one client only. when the Exe is running from one client then no other client can run this exe.
>So what code i include in this.
>
>Thanks,
>...ashish

Here are a couple fo approaches I have used in the past:
1. Set a falg in a database table on startup. Turn the flag off on exit. Do not allow entry unless the flag is off. You need a supervisor override though in case a program crashes without setting the flag back.

2. Open a specified text file for writing. The next user that tries to open the file will get an error which you can trap and give the appropriate message, etc.