GetRexxVar() and SetRexxVar()
    GetRexxVar() attempts to extract the value of a variable from a
    running ARexx script/program.  SetRexxVar() will attempt to set the
    value of a particular variable in a running ARexx script.

CheckRexxMsg()
    This function checks to make sure that a RexxMsg is from ARexx
    directly. Messages used by the Rexx Variable Interface (RVI) routines
    are required to be directly from ARexx.

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