handheld devices, such as Personal Digital Assistants (PDAs) including devices running PalmOS or Pocket PCs, and mobile phones, can be used when they are communicating with a "regular" personal computer (PC), with other handhelds, and with computerized devices such as telephones, radios, microwave ovens, automobiles, and factory equipment.
Just saw nifty demo of this project. Pretty amazing what one can do with a PDA.