I don't think that you can do this. If you take a look at perldoc perlfork it tells you that forking is emulated on Win32 so as far as the OS is concerned all children reside in the same process space. There's also a paragraph in there that says, well, here it is...

A way to mark a pseudo-processes as running detached from their parent (so that the parent would not have to wait() for them if it doesn't want to) will be provided in future.

Bummer.

update A little knowledge can make you abulic.
I just followed tachyon's suggestion and see that there are in fact ways to do this.

Good Luck,
Ira,

"So... What do all these little arrows mean?"
~unknown