INT 21 - IBM Genie - Resident Manager - INSTALLATION CHECK AX = 5757h BX = 5757h Return: AX = 0000h if installed BX = ??? DX = ??? DS:SI -> list of 27 DWORD entry point addresses Program: IBM Genie is a set of utility TSRs by Helix Software Note: other functions possible if BX <> 5757h, but details not yet available