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From: jg@max.crl.dec.com (Jim Gettys)
Newsgroups: comp.windows.x
Subject: Re: Shared Memory Connection
Message-ID: <5231@crltrx.crl.dec.com>
Date: 4 May 90 15:08:28 GMT
References: <1990May1.233911.639@caen.engin.umich.edu> <9005021314.AA11466@expire.lcs.mit.edu>
Sender: news@crltrx.crl.dec.com
Reply-To: jg@max.crl.dec.com (Jim Gettys)
Organization: DEC Cambridge Research Lab
Lines: 20

And comparing tracking between a Sun machine (any flavor) and a
VAX/DECstation is 
fraught with dangers....

For example, Digital spends the $10 for cursor hardware, and Sun does
not spend it; this makes a big difference in tracking situations.
(as to the explanation of why, I leave it to the advanced student....)

Also, the DEC device driver interface to the server (shared memory
event queue) helps tracking applications alot.  A number of other
companies (in addition to Digital) implement this form of interface.
If your manufacturer doesn't, you should ask them to.  (I haven't
flamed in public about this for several years, maybe I should loose
another tirade on what/why this is a good idea...  System calls
are evil, and all that...  It got us good tracking on poor .5 mip 11/750's
on VS100's many moons ago....).

So you must be careful in analyzing what is going on here....  It often
has little or nothing to do with transport.
				- Jim