Int 2F/AX=A4E0h

AX = A4E0h

Return:
AL = 52h ("R") if installed
AH = major version plus 30h ("0")
ES:BX -> ??? (INT A4 handler???)

Note: Older versions of Right Hand Man (from which Team evolved) store the signature "RH" at offset 103h in the INT 2F handler's segment

See Also: INT A4"Right Hand Man"