This document discusses the 5 pen pc technology. It was created in 2003 by a Japanese company as a "Pen-style Personal Networking Gadget" consisting of 5 functions: a CPU pen, camera, virtual keyboard, visual output, and phone. The CPU pen acts as the computing engine and uses a dual core processor. A virtual laser keyboard projects onto surfaces. The LED projector provides a 1024x768 resolution monitor. It connects to the internet through a cellular phone function and uses Wi-Fi and Bluetooth connectivity. Benefits include portability and ubiquitous computing, while drawbacks include cost, battery life, and the unproven keyboard concept.