•Norman can only read an instruction from one mailbox, execute it, and then move onto the next mailbox. But
sometimes the program wants him to jump to a new
address, in which case the program gives
him a pointer to the next instruction he
should execute (instead of just the one in the next mailbox).
•The pointer is just a number which is the address of another mailbox.
•The program
counter is the number that the mailroom worker has to remember in order to remember what mailbox’s instruction he is executing at any moment.