[net.micro.cpm] CP/M S1 byte ?

bridger@rand-unix.ARPA (Bridger Mitchell) (07/22/85)

Can anyone enlighten me as to what the S1 (not S2) byte
in the fcb and directory entry does, in both CP/M 2.2 and
later systems?  Are any applications or system utilities using it?

--bridger mitchell