INT 16 - Doorway v2.x+ - INSTALLATION CHECK / REDIRECTION CONTROLa AH = 67h AL = Doorway mode 00h turn off DOS redirection 01h turn on DOS redirection Return: AH = 80h if Doorway is actively redirecting output AL = 80h if Doorway was already in requested mode Program: Doorway is a program by Marshall Dudley which allows most DOS programs to run as a BBS door without modification Note: to perform an installation check without changing the redirection state, if is necessary to restore the original mode if AL was not 80h on return SeeAlso: INT 10/AH=BBh"Doorway"