In addition to what dasgar said here are a few nodes I found on super search that mention Win32::Process or related modules.

Win32::CreateProcess problem,

Re: Reading output of external program without Shell,

Starting an Application on another PC,

Re^4: Multiple system commands in parallel,

Re: Capturing errors from 3-arg pipe open in ActivePerl 5.020,

Re^4: Executing perl program from another perl program and capturing the output,

Re^7: Running a perl script as a system command in another thread hangs while main thread reading from STDIN,

various questions about Win32::Process,