Soldiers in the Roman Legions used to shave down pig knuckles into the shapes of cubes, and toss them onto their inverted shields as a form of entertainment while in camp. Hence we get the term "to roll the bones". We do know that the game we know today as "craps" came to the United States from Europe.

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)