A high density electrical interconnect is disclosed that uses a bayonet action to mate a plug having a plurality of contacts to receptacle having a plurality of spring contacts. The invented techniques allow multiple application software programs to execute in parallel on a shared CPU, with application ready-to-execute status adaptive scheduling of CPU cycles and context switching between applications done in hardware logic, without a need for system software involvement. A display at the user site displays various communication options to the user such to call a number, call by name, or look at a directory of names. Further, the DC bus may couple to an inverter.