A program for protocol verification which mechanically generates all states reachable from a given initial state and checks the validity of user defined conditions in each state.
验证协议的程序，它从一个给定的初始状态机械地产生出一切可以到达的状态，并且审查每一状态下用户定义的条件的有效性。
The actions taken to implement protocols.
为实现协议而采取的动作。
