One embodiment of the present invention relates to a modular computer system for use in residential, recreational, and commercial regions. The system is a computer system disposed within an existing outlet receptacle housing. The receptacle includes a conventional NEMA standard OS1 and OS2 type electrical housing and electrical line designed to accommodate a residential or commercial light switch, electrical outlet, etc. The computer system is electrically coupled to the electrical line disposed within the housing of the receptacle and includes a mechanically extendable expansion bus configured to mechanically support and data inter-couple a set of modules for providing computer functionality. The expansion bus can be extended to access the modules or collapsed within the receptacle so as to be externally visually obscured by an interface module or cover. The computer system is configured to dynamically detect and data couple with other modular computer systems in a particular region.