OK, fellows, (I thought there might be some modules available...forgive me), as I mentioned earlier, what I need now is a demo (or more exactly, a toy version), it's okay when it displays, so keszler's idea is applicable here. Later this grows to a larger one, I think I should use the triggers.

Non-Perl-based ideas are welcomed here, too. :-p

Once again, I'd like to thank everybody for your help, thank you.