INT 2F - DOS 3.0+ ASSIGN - INSTALLATION CHECK AX = 0600h Return: AL = status 00h not installed 01h not installed, but not OK to install FFh installed Notes: ASSIGN is not a TSR in DR DOS 5.0; it is internally replaced by SUBST (see INT 21/AH=52h) undocumented prior to the release of DOS 5.0 SeeAlso: AX=0601h,INT 21/AH=52h