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Parameter 


   Parameters are defined as either formal or actual.  Formal parameters
   are the receiving memory variables specified as arguments of the
   PARAMETERS command.  Actual parameters are the arguments of the
   calling DO...WITH or the user-defined function.

   There are two methods of passing parameters, by value or by
   reference.  By value means that the actual parameter is evaluated and
   the result is placed in a memory location.  When the subsequent
   PARAMETERS command executes, the value is transferred to the
   receiving variable.  Passing by reference, by contrast, means that a
   pointer to the location of the actual parameter is passed instead of
   the value.  Subsequent changes to the formal parameter are actually
   changes to the actual parameter, hence the term passing by reference.

   Note: Clipper there is no argument checking and therefore no
   requirement that the number of actual parameters match the number of
   formal parameters.