I do not know how to do it through Perl, it might be easily altered to work. When I am in bash I use something like:

echo "Hello!" >/dev/tty2
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I hope my arrow is pointing the right direction :). This does not open the window, but it prints to an existing terminal session.

I have not tried it yet, but you may be able to:

open(TERMINAL,'>/dev/tty2');
. . .
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In case it is important, I am doing this on SuSE Linux Pro 8.2 :), it seems that tty12 is reserved for error messages.