ADDENDVM to ENSI standard 14.42.0, "Preliminary guidelines for the ENSI stream-based OS System" ------------------------------------------------------------ (W) To ease degradation of old esoteric programs to be compatible with the ENSI OS System, by default Backwards Compatibility Mode (MCB) is enabled. In this mode all ENSI OS System Commands operate in the following way: When not followed by the Backwards Compatibility Mode Disindicator, the commands are simply passed through to standard output. When followed by the Backwards Compatibility Mode Disindicator, the commands are interpreted, and Backwards Compatibility Mode is permanently disindicated. The Backwards Compatibility Mode Disindicator is the number 42.