A multi-processor mobile computing device includes a first processor connected to a first operating memory and a mobile display and powered by a portable power source integrated into the multi-processor mobile computing device, a second processor connected to a second operating memory and a display input-output port; the second processor is activated only when mobile device is connected to an external power source. The device includes a dual-function operating system, including a mobile operating system module operating on the first processor, the mobile operating system module having a first capability set and a desktop operating system module operating on the second processor; the desktop operating system module having a second capability set, wherein the second capability set differs from the first capability set.