ELSEIFDEF        ELSE With IFDEF                                    Directive

  ELSEIFDEF name

     This directive is the same as an ELSE followed by an IFDEF. (IFDEF is
     satified if name is defined.) It is used to start a nested
     conditional block. For example:

                        IF NUMBER EQ 5
                           add ax,3
                        ELSEIFDEF GEORGE
                           add bx,2
                        ELSE
                           add cx,1
                        ENDIF

       Notes:     See ELSEIF and IFDEF for more information.