The Pebbles project is exploring how Personal Digital Assistants (PDAs), such as the Palm Handheld or a device running the Microsoft Windows CE or Pocket PC operating systems, can be used when they are communicating with a "regular" personal computer (PC), with other PDAs, and with computerized devices such as telephones, radios, microwave ovens and factory equipment.

Link to Project
http://www.cs.cmu.edu/~pebbles/