A handheld computing unit includes a processing module, a main memory interface coupled to main memory, a baseband processing module, an RF section, I/O interfaces, a bus structure, and a connection structure. The main memory includes an operating system section and a user section. The operating system section stores at least a portion of a remote mode operating system when in a remote mode and stores at least a portion of a docked mode operating system when in a docked mode. The docked mode operating system includes at least some of the remote mode operating system.