Your problem description is a little obtuse to me; code is worth 1k words. See How do I post a question effectively?.

One possible solution to your issue as I understand it would be to fork or use threads. Which you pick depends on a lot of particulars of what you intend to do while the files are open and once the files are closed. Using a fork and exec might look like: 

$SIG{CHLD} = "IGNORE";
for my $file (@files) {
    exec $file unless fork;
}

[download]

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re: start up process without waiting by kennethk
in thread start up process without waiting by exilepanda

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