INT 21 - ELRES v1.0 only - INSTALLATION CHECK AH = 4Bh DS:DX = 0000h:0000h Return: ES:BX -> ELRES history structure (see AH=2Bh/CX=454Ch) DX = DABEh (signature, DAve BEnnett) Note: ELRES is an MSDOS return code (errorlevel) recorder by David H. Bennett