Basically, as I understand it, in order to circumvent the university's
monopoly of $0.55 cokes, the CS dept maintains its own machine and
sells for $0.35. The machine itself does not accept money, but
instead you need to get an account and write a check to one of the
coke machine gurus.
The account will automatically tell you when your funds are low
(low-water level set by each user), and you can transfer funds to
other users, etc.
Martin A. Reames email@example.com