To be honest, ethernet cards and cable are pretty dirt cheap nowadays. Might be worth the time, effort, and expense to just hook them up with a method that actually is designed for transfering files. Back in the day when LPT communication was prevalent, network cards were well over a hundred dollars. And LPT ports were built-in (well, I suppose the pedantic might point out that they usually still are). So it would be cheaper to grab a parallel cable or two, splice them up, and communicate that way. I even recall doing this once as a "fast" way to share files between my BBS and someone else's.

Nowadays, $10 gets you two ethernet cards which are usually just plug-and-play. Another $10 maybe will get you a cross-over ethernet cable. And, if both sides are Windows, you should already be able to "net use" from one to the other. So, for $20+tax, you can use all the built-in networking of your current systems rather than debugging something built nearly from scratch. And you can do much more with it - have one machine print to the other machine's printer, for example. Or anything else that NetBEUI or TCP can do.

I mean, perl is great and all, but at the end of the day, there is a job to be done, and it can be less expensive to do things the normal way than other ways ;-)