Gaming machines, including electronic gaming machines and poker machines, slot machines for gaming, parts and accessories for gaming machines, token operated slot machines and video game machines, gaming systems for controlling selection of machines units for winning jackpots, gaming control systems for deterministic and non deterministic jackpots; wagering games of chance for gaming machines including electronic gaming machines, slot machines and poker machines; electronic systems for directly or indirectly linking gaming machines, signalling devices which are responsive to signals from gaming or poker machines, electronically interconnected gaming and poker machines, microprocessors and microprocessor systems for directly or indirectly linking gaming or poker machines