A portable personal computer including a housing sized to be held in a single hand during use of the computer, allowing the free hand to input data. The housing at least in part supports a general image display, and a proportional sensor for creating a varying value according to varying depression applied...http://www.google.de/patents/US6559831?utm_source=gb-gplus-sharePatent US6559831 - Analog controls housed with electronic displays for personal digital assistants
