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. CROSS REFERENCE TO RELATED APPLICATIONS This application is a divisional broadening reissue application of broadening reissue application Ser. 13/188,239, filed Jul.

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Crack Scene Faro. 21, 2011, which in turn is a divisional broadening reissue application of Ser. 11/907,832, filed Oct. 17, 2007, now U.S. 42,738; which in turn is a broadening reissue application of Ser.

09/171,921, now U.S. 6,956,564, issued Oct. 18, 2005; which is the 35 USC 371 National Stage Entry of International patent application serial number PCT/GB98/03016, filed Oct.

8, 1998, claiming priority of GB9722766. Rc4 Stream Cipher And Its Variants Pdf Writer. 4, filed Oct. 28, 1997, the entire disclosures of which are herein incorporated by reference in their entireties; and is related to the following reissue applications: Ser. 12/255,557, filed Oct. 21, 2008; Ser. 12/268,254, filed Nov.

10, 2008, now U.S. 12/268,336, filed Nov. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to portable computers and more particularly but not exclusively to hand-held computers of the kind sometimes referred to as personal digital assistants. Related Art A personal digital assistant includes data files defining such items as an electronic diary, address book and other applications such as word processing software, calculators and the like. As more powerful memories and processors have been developed in smaller packages it has become possible to provide quite powerful computers in relatively small portable eases.

However, the limitation of miniaturisation occurs when a viewing screen and keyboard are needed for data input and read out. Thus, so called palm top personal computers (PPC) are usually of the order of 15 cm by 7 cm in order to provide a readable screen and a usable keyboard. Such palm top computers are known, for example Psion Corporation have produced a Psion Series 5 (trade mark) PPC having an 8 megabyte RAM and processor while Hewlett Packard similarly produce PPCs as e.g.