	D is program to display device-specific information.  The
display includes various parameters about the device (which parameters
depends on the device) in the first third of the screen; various
parameters with respect to the I/O request queue for the device (including
the affiliated ACP queue if applicable) in the second third, and more
device-dependent information in the last third.  Currently, the only
information supported in the last third is the disk fragmentation
pattern for disk devices.  Future updates will hopefully include
terminal traffic for those devices.
	D requies CMKRNL, CMEXEC, and PFNMAP privileges (the system
non-paged pool is mapped as a page frame section).
	Most of the parameters are reasonably well described.  The IRP
display (middle third) is probably most well documented in the Device
Driver manual.  An asterisk following a line in the IRP listing denotes
the current I/O request; a dollar sign signifies an ACP request (note
that if an ACP is shared, the request may be for any of the devices
with which that ACP is affiliated).
	The fragmentation display shows the size of the hole followed
in parentheses by the number of holes of that size.  If there is no
parenthesized number, there is only one hole of the given size.  Because
of VMS caching, this display is somewhat approximate and it will be noted
that the numbers do not add up to the total free space on the disk.
	The commands for D are the following:

	D<device-name>$	Switch the display to the specified device.
			The angle-brackets are mrerely for clarificattion
			of the argument in the above and are not typed;
			the "$" is the <ESC> character (Example:
			DBDBA0<ESC>).

	The update time for D is currently a fixed 5 seconds.  This will
be altered in a future release.
