Sun periodically issues technical documents refered to as "White
Papers". The most recent one distributed to Sun Field Offices are

	"The XView Toolkit: An Architectural Overview", Thomas W.R. Jacobs
and
	"X11/NeWS Design Overview", Robin Schaufler

Here are the abstracts from these papers:
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            "The XView Toolkit: An Architectural Overview"
                         Thomas W.R. Jacobs

			     ABSTRACT

The XView Toolkit is an object-oriented user interface toolkit designed
for the X Window System Version 11 (X11).  XView is based upon a mature
toolkit named SunView.  Retargeting SunView to run on X11 required
changes to the toolkit's most critical components.  This paper details
the issues in transforming an existing toolkit that ran on a
kernel-based window system into an object- oriented toolkit that runs
on a server-based window system.

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		     "X11/NeWS Design Overview"
	   	          Robin Schaufler

			     ABSTRACT

The X11/NeWS server is a general, unified window system server that
supports the X11 protocol and the NeWS protocol.  Because the X11
semantics and the NeWS semantics share many properties, much of the
underlying implementation is common to both.  Where the differences
cannot be resolved to a common model, the union of the two sets of
semantics is provided.  Because both protocol implementations coexist
in a single server, both X11 and NeWS clients can share the screen and
input devices.  A single window manager that manages windows created
using both protocols gives the user an integrated interface.

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To obtain copies of these papers, please contact you Sun
Representative.

-johnj