|Do you know where your variables are?|
Not knowing your environment, these suggestion are just guesstimates.
I usually work on *nix, so I opened a XP laptop to verify this will work, and it did. so here goes.
I opened two command windows (cmd.exe) on the XP, ran Vim in one, and executed the edited Perl script in the other. I could edit with Vim and could interact with the running script by just switching windows.
For my *nix environments, I run 5 x-windows by default. 3 x-windows are used for Perl programming:
The other 2 windows are used for doing system admin functions as needed. This way I can be interrupted for an emergency, and when things are fixed, I can go back to programming without missing a beat.
This may not be a solution to your problem, but it may help.
"Well done is better than well said." - Benjamin Franklin