8.3.5 The RexxQueryFunction() function

This function retrieves the status of an external function
handler.  The prototype of the function is:

     APIRET APIENTRY RexxQueryFunction(
           PSZ FuncName
     ) ;

The significance of the parameters is:

     [FuncName]
          Points to an ASCII NUL terminated character string which
          defines the name of the external function to be
          registered. This is the same name as the REXX
          interpreter uses with a function call or via  the CALL
          command.

The returned value from RexxQueryFunction() can be one of:

     [RXFUNC_OK]
          The external function handler was found.
     [RXFUNC_NOTREG]
          The handler was not found.


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