Mark Eppley has been around the PC business almost since day one, when he invented a special cable to enable two computers to transfer data between them. Laplink went on to be one of the longest-selling brands in PC history, eventually selling more than 30 million copies, and Eppley became a fixture at industry conferences and events. Now the venerable pitchman is running a new business called SC-Integrity that has nothing to do with laptops, cables, or computers - directly. Call it LoJack for finding lost tractor trailer freight loads.