PREDATOR locks your PC when you are away, even if your Windows session is still opened. It uses a regular USB flash drive as an access-control device.
PREDATOR can protect several PCs with the same USB flash drive, e.g. your home and office computers. PREDATOR frequently changes the security codes recorded on your USB drive. If an intruder manages to copy your stick, this copy will not work because the codes on your own stick will have changed in the meantime.