tic Tac Toe程序。可以供一到兩個玩家使用。程序中使用了visual basic 計時器，所以每一個步驟都有時間限制。此外，計算機可是一個有簡單智能的對手，他不但不會隨便出手，反而還要竭力贏了你才罷休。
tic Tac Toe program. One or two players. It uses the visual basic timer, so each move has time limit. Simple artificial intelligence: computer does not play randomly, but "tries" to win and stop you from winning.
