Charles does another great overview of the VASSAL implementation of RITD
Rommel in the Desert is a game touching on the conflict between the British and Germans in North Africa during WWII. A game of maneuver, each side has to move with precision and know when to strike, since a cut in supply spells disaster for either side. The supply system is card driven. The game comes with a well painted map of North Africa and 100 wooden blocks to represent the British and Germans.
This title uses Columbia Games Block system. While there are variations in the rule sets for each of their games none the less all of their games are based on block system. Basically this means that rather than the traditional use of counters to represent units on the map the game instead uses wooden blocks that stand upright and with unit details only shown on one side of the blocks.
This does two things: First it provides an easy way of producing a “fog of war” because your opponent can not tell, save through good memory, what type of unit a specific piece is and its current strength. Second, by having the blocks stand on end it provides a way to keep track of a units strength by rotating the block so the current strength is the top number.
Most war games have some type of mechanism that lets units take steps in their overall strength. Counters normally have at most two steps because of they only have two sides, however blocks have four and so now you can easily keep track of twice the amount of detail that many other war games provide.