Disclaimer: I don't know anything about windows. This is just a suggestion and it's probably not correct, but I figured I'd post it on the off-chance that it is.

Expect.pm allows communication with other programs/processes. A description can be found at cpan. It would be used for something like having your program ftp a file (start ftp, expect 'username' and send the username, expect 'password' and send the password, etc).

To quote: "Expect.pm is built to either spawn a process or take an existing filehandle and interact with it such that normally interactive tasks can be done without operator assistance. This concept makes more sense if you are already familiar with the versatile Tcl version of Expect."