Zero Cool--real name Dade Murphy--is a legend among his peers. In 1988, he single-handedly crashed 1,507 computers on Wall Street, creating worldwide financial chaos. Eleven years old, Dade Murphy had a record with the F.B.I.--forbidden to finger the keys of so much as a touchtone phone until his 18th birthday. It's been seven years without a byte... and he's hungry. Kate Libby, handle Acid Burn, has a souped-up laptop that can do 0 to 60 on the infobahn in a nanosecond.