Portable computers

A portable computer hand held cellular telephone arranged to rest comfortably in the hand has a small display screen. Accelerometers capable of detecting movement of the pen cellular telephone with respect to gravity provide input to a microcontroller which selects a response from a number of viewing modes. The pen cellular telephone may be held in either hand and the output message to the screen will be oriented according to the location of the pen cellular telephone. Full personal digital assistance functionality may be incorporated in a relatively small plastics casing and functions, such as calendar, contracts contacts and the like may be incorporated.