Computer system 901 may also include a display controller 909 coupled to the bus 902 to control a display 910, such as a cathode ray tube (CRT), for displaying information to a computer user. Computer system 901 includes input devices, such as a keyboard 911 and a pointing device 912, for interacting with a computer user and providing information to the processor 903. The pointing device 912, for example, may be a mouse, a trackball, or a pointing stick for communicating direction information and command selections to the processor 903 and for controlling cursor movement on the display 910.
Computer system 901 performs a portion or all of the processing steps of the process in response to the processor 903 executing one or more sequences of one or more instructions contained in a memory, such as the main memory 904. Such instructions may be read into the main memory 904 from another computer readable medium, such as a hard disk 907 or a removable media drive 908. One or more processors in a multi-processing arrangement may also be employed to execute the sequences of instructions contained in main memory 904. 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 software.