I'm still using WordPerfect on my NEC laptop with a blazing 6MHz processor and 20Mb disk drive. I don't know if that counts as running, though. The clock can't handle dates after 1990.
Oh well, even if I don't count that one, I'm still at 10+.
How many of your computers run PERL?
How many of your computers are connected to a network?
How many of your computers are connected to more than one network?