According to Richard Epstein, craps is descended from an earlier game known as Hazard, that dates to the Middle Ages. The formal rules for Hazard were established by Montmort early in the 1700s. The origin of the name craps is shrouded in doubt, but it may have come from the English crabs, or from the French Crapeaud (for toad)

To bet with the shooter, you must place your bet in an area marked ""Pass Line", before the new shooter rolls the dice. The so-called "Pass Line" is a strip on the table layout marked by two lines roughly two inches wide and it rims the entire table layout across from the Box Man. To bet against the shooter, you must place your bet in an area marked "Don’t Pass". This area is a strip on the table layout and it rims the table directly above the "Pass Line".No matter what stage the game is in, whether on the "Come Out" roll, or in progress, you can jump in immediately and place any bets. The only exception to this is the bet called the "Pass Line" bet with odds", which can be made only on the "Come Out" roll. You can, however, bet with the shooter even while the game is in progress by placing a "Pass Line" bet without odds. Placing your chips halfway over one of the two lines framing the "Pass Line" area does this.

Button Descriptions Roll: Clicking on the Roll button after placing a bet starts a new round. Repeat: Clicking on the Repeat button will repeat all the bets made on the previous round that can be validly placed now. Clear: Clicking on the Clear button removes all the bets on the table that can be removed. Most bets can be removed, added to, or deducted from at any time. Exceptions would be the pass and come bets, and you cannot exceed the maximum bet on the odds. Table Min/Max: Look here to find the minimum and maximum total of the bets allowed. Bet Regions: When moving the cursor over the bet regions a yellow “tag” will appear that gives the name of the bet, the current amount placed for that bet, and the minimum and maximum amounts that can be placed on that bet. If a green highlight appears in a region, that indicates this bet can be added to (changed) If a red highlight appears, this bet cannot be increased (but sometimes can be removed)