The easiest way I may think of is to redirect the output of your script to some file, and monitor its content with tail:

term1% myscript.pl > /tmp/logfile

term2% tail -f /tmp/logfile
[download]

Even better, you can both have the output into the first windows and in the log file, with tee:

term1% myscript.pl | tee /tmp/logfile
[download]

IIRC there is a "CON:" device existing in windows, but I don't know what it is and what it's used for.