SHA or SHADOW is used by the system manager to control shadow recording.
The general format for a SHADOW command is:
 	>SHA keyword parameter-list
 
Available keywords:
	ABORT    - stops shadow recording of a shadowed pair while catch-up
		   is in progress. 
	CONTINUE - restarts shadow recording on a previously shadowed pair.
	DISPLAY  - displays all shadowed disk pairs.
	START    - starts shadow recording and initiates a catch-up on the
		   specified disk pair.
	STOP     - stops shadow recording of a disk pair. 

The format of each command:
	ABORT ddnn: 
	CONTINUE ddnn: TO ddxx:
	DISPLAY
	START ddnn: TO ddxx:
	STOP ddnn:
where:
	ddnn: = primary device
	ddxx: = secondary device 
		The secondary volume must be mounted foreign.
