A pointing device of a computer having absolute and relative positioning capability is disclosed. In a mouse pointing device embodiment, the mouse is movable over a mouse pad having a surface having a plurality of uniquely coded positions. The mouse includes a mechanism to detect the position over which...http://www.google.com.au/patents/US6078312?utm_source=gb-gplus-sharePatent US6078312 - Pointing device with absolute and relative positioning capability
