BCAM dependencies on starting and terminating POSIX

The POSIX subsystem can only be started following the command ’BCAM READY’.

When BCAM has been restarted, the POSIX subsystem must also be shut down and restarted. Until the POSIX subsystem has been terminated, this is indicated by console message POS1040, which can be displayed using /SHOW-PENDING-MSG (/STATUS MSG).