MC3 is a catch all task which is identical to the MC2 task
described in the NASA/Ames BAYLUG DECUS submission documentation
except that it does not have transparent command line passing
to non-installed tasks and therefore does not need the
executive or INS enhancements that MC2 needs.  It is a non-privileged
task and installs under the name ...CA.  It then implements the
following features:  (From AMESCHGS.DOC file.)

New tasks [1,54]:

MC2.MAC, MC2.TSK  (non-privileged task)

	This is a MCR catch all task (...CA.) that implements 14 commands
	of its own, searches directories for .TSK or .CMD files to
	process commands it can't handle and automatically invokes them,
	waits for their completion and passes back their exit status to
	MC2's parent.  It will dynamically INStall and invoke task images, 
	passing them through SPWN$ the command line that MC2 received.
	It will use STLO$ to wait for the spawned task to complete unless
	the system does not support the STOP directives in which case it
	uses WTSE$.  MC2 does require parent/offspring tasking to be
	included in the executive.  The searching sequence is driven by
	tables in the front of the code and is easily changed.  The default
	sequence is:

	1st) SY:[default_uic]
	2nd) SY:[protection_uic]  (If different from default_uic.)
	3rd) CM:[1,55]		  (To be compatible with old MC2.)
	4th) LB:[1,54]		  (Verifies task is executable first.)
	5th) CM:[1,56]		  (Only for privileged users.)
	6th) CM1:[1,55]
	7th) CM1:[1,56]		  (Only for privileged users.)

	If CM: or CM1: logical devices do not exist it will skip looking
	in the corresponding directories.  These are usually set up with
	"ASN dduu:=CM:/GBL" commands under VMR if [1,55] and [1,56] support
	is desired (see V3.1 MC2).  One change from the old MC2 is that
	since the task is no longer a privileged task it can no longer
	directly obtain the login UIC.  Instead it gets the protection UIC
	using GTSK$ which for non-privileged users is their login UIC but
	for privileged users is their default UIC.  Hence it does not
	look in privileged users login UIC unless it is also their current
	default UIC (set by the "SET /UIC", "CHD" or "UIC" commands).
	It does not allow non-privileged users to invoke privileged tasks
	unless the task is found in [1,55] or unless it is found in LB:[1,54]
	and a .PRV file has been found first with the same command name as
	the filename.  A good example of this is WHO.TSK which is a
	privileged task but is one that you want anyone to be able to invoke.
	Simply put WHO.TSK in LB:[1,54] and create a WHO.PRV by issuing the
	command "PIP WHO.PRV=NL:".  Then do a "SRD /NA/WB" so the WHO.PRV
	will be in the directory before the WHO.TSK.

	The internal commands that MC2 proccesses and re-issues via SPWN$
	to MCR... are:  (only first 3 chars of command are necessary)

	ATS		- Same as "ACT /ALL"
	CHD		- Same as "SET /UIC"
	CHD grp,mem	- Same as "SET /UIC=[grp,mem]"
	DELETE filespec	- Same as "PIP filespec/DE"
	DIR filespec	- Same as "PIP filespec/LI"
	DLG		- Same as "DEV /LOG"
	ERASE filespec	- Same as "PIP filespec/DE" except ;* assumed
	FREE dduu:	- Same as "PIP dduu:/FR"
	POOL		- Same as "SET /POOL"
	PURGE filespec	- Same as "PIP filespec/PU"
	RENAME file1=file2 - Same as "PIP file1=file2/RE"
	SPOOL filespec	- Same as "PIP filespec/SP"
	TRUNC filespec	- Same as "PIP filespec/TR"
	TYPE filespec	- Same as "PIP TI:=filespec"
	UIC		- Identical to CHD

	"filespec" can contain more than one filename separated by
	commas.  ERA is identical to DEL except ERA inserts a ";*"
	as a version number on all filenames that do not specify a
	version number to be deleted.  Remember that a command line
	can only be 79. characters and any expansion of the command
	that MC2 does subtracts from that 79.