P-Comm is faster-than-light communication related to T-space travel. The range is limited, but it is possible to communicate with nearby star systems. The devices are small enough to fit onto small spaceships. However, the P-comm cannot be used while actually traveling in T-space.
Hand-held devices may be used to communicate at relatively short ranges (from surface to orbit, for example, or from a planet to its moon) using the P-comm network channels.