3. When making kits for field test or SDC submission, the system MUST be shutdown to single-user mode, as follows: o Login to the `operator' account, shutdown to single-user mode, then escape to the shell by typing `!sh'. o Mount all file systems by typing `/etc/mount -a'. o Type `cd /usr/sys/distr', then `mkb' to begin the build. o When the build completes, exit from mkb and dismount all file systems by typing `/etc/umount -a', then return to operator services program by typing <CTRL/D>. o Type `r' to restart time-sharing, then <CTRL/D> to exit from the operator services program.