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(Terminate and Stay Resident) A program which remains in memory after terminating in order to provide services to other programs or the user. The name comes from the name of the DOS function call used to remain in memory after termination. in DR DOS 5.0; it is internally replaced by SUBST (see INT 21/AH=52h) undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.). Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated. prior to the release of DOS 5.0 SeeAlso: AX=0601h,INT 21/AH=52h