Int 21 Fn 4B  - Elres V1.0 Only - Installation Check                       [U]

   AH = 4Bh
   DS:DX = 0000h:0000h

Return: ES:BX -> ELRES history structure (see #1069 at AH=2Bh/CX=454Ch)
   DX = DABEh (signature, DAve BEnnett)
Program: ELRES is an MS-DOS return code (errorlevel) recorder by David H.
     Bennett

See Also: AH=2Bh/CX=454Ch