The leftmost part is a standard Coca-Cola logo.
The next part is a set of lights representing the diodes on the front of the actual coke machine. If a diode is off, its corresponding light in the xcoke window appears white, and if the diode is on, the light appears black. The topmost square represents the "Use Correct Change" diode on the coke machine, and the six circles represent column 1 through 6, respectively.
If a diode is lit, the corresponding column is empty. If a diode is not lit, it is only possible to determine that the column is non-empty (which we will term full). It is not possible to determine how many cokes are actually left in each column in the vending machine.
The third part displays a number representing the amount of cokes sold from the column monitored by the light to the left, since it last changed state from empty->full.
The rightmost shows the elapsed time since the particular column changed state from empty->full or full->empty. The format for elapsed time is DAYS-HOURS:MINUTES.
If there is no network connection, or the coke-server is down (the first is by far the most probable), the xcoke-window will become grey, and the use-correct change diode will become half as large as the other diodes :)
(This is equivalent to -notime -noamount).
If you are running it under the TWM windows manager (if you don't know what window manager you are running, then you probably are!) you probably want to add "xcoke" to the NoTitle section of your ~/.twmrc file in order to remove the titlebar from the xcoke window.
/usr/local/dikunix/bin/xcoke -geometry 156x90-1+150 &