Usually 10h (single-user) or 14h (multi-user).
While earlier releases of the system utilities performed a test for a version
code of (>)= (10)xxh, this was changed with DR-OpenDOS 7.02+ (now taking a
possible multi-user version into account): Most utilities now test for AH being
either 10h or 14h, and a BDOS version >=xxh to allow them to properly run on
possible future multi-user releases of DR-DOS. Before doing this test, some of
them strip off the CP/Net bit.