The P-ISM consists of 5 functions: a CPU pen, camera, virtual keyboard, visual output projector, and phone. It allows users to perform computer functions like typing and viewing content on any flat surface. The pen acts as the computing engine and connects to the internet via Bluetooth and Wi-Fi through a cellular phone function. While portable and enabling ubiquitous computing, challenges include cost, battery life, and the virtual keyboard concept not being novel. The document concludes that this was just the start of more compact communication devices to come.