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  Name:     curdrive() - get the logged drive letter
  Usage:    <string> = curdrive()
  Params:   none
  Returns:  string equal to the currently logged drive in format "d:"

 ---------------------------------- Example ---------------------------------

                 @ 10,0 say "Logged Drive :"+curdrive()
                 @ 11,0 say "Logged Directory :"+curdir()

  Note:     The Clipper curdrive() only returns a drive letter such as
            'A'. The FUNCky curdrive() returns a full drive specifier as
            in 'A:'.