meh.

for (1..5) {
   system('start DoThis.exe');
}
[download]

vs

my @pids;
for (1..5) {
   push @pids, system(1, "DoThis.exe");
}

waitpid($_, 0) for @pids;
[download]

Maybe zombies don't matter and you can reduce the latter to something akin to the former, but we haven't been told that.

Then again, I would want to know if the children died, and using start hides that data.