What OS are you running?

Under XP the start cmd will launch a separate cmd shell for each program you specify and then return to the calling cmd file.
Are you calling start from a Perl script?
Do you want the processes to return to the calling program (then you need threads).

Some code would be great, so that we can understand exactly what you are doing.

In reply to Re: Running a process in the background by terra incognita
in thread Running a process in the background by Anonymous Monk

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