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  1. or download this
    open(AT, "|at now + 2 minutes") or die "...";
    print AT "/....../mifuture.cgi idnumber=220\n";
    close(AT) or die "...";    # non-zero exit status
    
  2. or download this
    fork && exit;    # CGI script returns/exits right then
    
    ...
       sleep $seconds;
       process($_);
    }