PAC系统支持5种参数许可机制:通过变量，通过数值，通过数值结果，通过结果和通过初始化值的结果。由类型，长度和许可机制具体确定一个参数。当参数是通过变量的，变量地址进入被调用块。被调用块内读写这个参数的所有逻辑直接访问实际变量。当参数是通过数值的，变量值拷贝到被调用块的本地堆栈寄存器中。被调用块内读写这个参数的所有逻辑直接访问堆栈寄存器。

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