network interface 150 that enables system 1000 to be coupled to a network???a network interface card is another example; and (c) RAM 170 and disk drive 180 are examples of a computer-readable memory (i.e., a tangible medium) for storage of computer code and computer programs???other types of computer-readable media include floppy disks, removable hard disks, optical storage media such as CD-ROMS,