Project PDA

The iPAQ is a Pocket PC and personal digital assistant first introduced by Compaq in November 1999. Since Hewlett Packard's acquisition of Compaq, the product has been marketed by HP. The device is the main competition to the Palm Pilot, but provides more multimedia capabilities and the familiar Microsoft Windows interface.

Higher end units were very modular, having "sleeve" accessories which would slide around the unit and add functionality like a card reader, wireless networking, GPS, and even extra batteries. PDAs branded "Pocket PC" run the proprietary Microsoft Pocket PC OS. HPCs and HPC Pros run earlier versions of the OS, namely Windows CE.