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8.3.4 The RexxDeregisterFunction() function

This function is used to remove a particular external function
handler from the list of registered external function handlers.
The prototype of the function is:

     APIRET APIENTRY RexxDeregisterFunction(
           PSZ FuncName
     ) ;

The parameter is an input values:

          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

The list of defined function handlers is searched, and if an
environment matching the one named by the parameter are found, it
is deleted.  This call is used to de-register function handlers
registered with either RexxRegisterFunctionExe() or

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

          The handler was successfully deleted.
          The handler was not found.

Most systems that do have dynamic linking have no method for
reclaiming the space used by dynamically linked routines. So, even
if you were able to load a dll, there are no guarantees that you
will be able to unload it.