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Mobile devices such as cell-phones and PDAs present unique opportunities and challenges. Naïve transfer of applications from full-size computers often fails because the interaction becomes too cumbersome and challenging for the user. We address these opportunities and challenges by giving portable devices commonsense knowledge -a large collection of simple facts about people and everyday life. We illustrate our approach with descriptions of several applications we have implemented for mobiledoi:10.1023/b:bttj.0000047602.54693.3d fatcat:2rrbtor7prf3ldkrdqde3n45pe