tube crt for displaying information to a user an input device 1412 e g alphanumeric and other keys is coupled to the bus 1406 for communicating information and command selections to the processor s 1407 according to one embodiment of the invention an individual computer system 1400 performs specific operations by their respective processor s 1407 executing one or more sequences of one or more instructions contained in the main memory 1408 such instructions may be read into the main memory 1408 from another computer usable medium such as the rom 1409 or the storage device 1410 execution of the sequences of instructions contained in the main memory 1408 causes the processor s 1407 to perform the processes described herein in alternative embodiments hard wired circuitry may be used in place of or in combination with software instructions thus embodiments are not limited to any specific combination of hardware circuitry and or software logic refers to hardware software or any combination of hardware and software the term u201c computer usable medium u201d as used herein refers to any medium that provides information or is usable by the processor s 1407 such a medium may take many forms including but not limited to non volatile volatile and transmission media non volatile media i e media that can retain information in the absence of power includes the rom 1409 cd rom magnetic tape and magnetic discs volatile media i e media that can not retain information in the absence of power includes the main memory 1408 transmission media includes coaxial.