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In the example described in section 2, the system posts the argument to the engine as the parameter "sys_argument." But the system also posts other parameters to the engine. These other parameters include parts of the request, "processed" versions of parts of the request, and "session variables." If you are not familiar with keywords and session variables in CMRL, then it may be helpful to read Keywords in CMRL and Session Variables in CMRL before proceeding.