A computing system comprising a pocket personal computer and a reader are disclosed. The pocket PC is pocket-sized and comprises flash memory, and optionally a processor and a GPS chip. The reader includes a monitor, a keyboard with docking port and an optional processor and at least one input/output USB connector. A user cannot interact with the pocket PC without the reader. The credit card size and capabilities of the pocket PC allows a user to easily carry virtually their entire computer in a pocket for use anywhere there is a reader. In addition, the pocket PC provides security against unauthorized use, even if lost or stolen. A password or fingerprints are required to access to the device, the circuit board may be coated with a protective coating and the system may include an RFID tag and RFID reader.