launch external program from asp.net

Hi,

I want to know how to launch an external executable from an asp.net application (wcf application) ?

With the visual studio i can launch a process with the ProcessStarInfo since from the global.asax in the application_satrt function but when i deploy my application into IISS(5.1/7) : i can't launch it (the process started briefly and it is killed).

Can anyone help?

Thanks,