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From: almquist@hpavla.AVO.HP.COM (Mike Almquist)
Newsgroups: comp.windows.x
Subject: Re: Spy X Window
Message-ID: <9070004@hpavla.AVO.HP.COM>
Date: 27 Jul 90 13:55:07 GMT
References: <194@melpar.UUCP>
Organization: Hewlett-Packard Avondale Division
Lines: 51

From article <194@melpar.UUCP>, by jim@melpar.UUCP (Jim Hopkins):
Date: Sun, 22 Jul 1990 05:30:42 GMT
Organization: Northern Telecom, Mtn. View, CA
>If you happen to be on SUN's, I have used a simple approach that is not
>dependent upon X: "rsh <student-machine> screendump | screenload".
>The effect is to transfer a snapshot of the student's screen, and display
>it on the teacher's machine.  We have a homogenous SUN 3/60 environment, so
>it works very well. The concept may be applicable to your needs.
[deleted . . .]
>-- 
>Ian Hopper		{amdahl.com,ames.arpa,hplabs}!ntmtv!hopper
>Northern Telecom Inc.	[Clever comment under construction.]

>From: mouse@SHAMASH.MCRCIM.MCGILL.EDU (der Mouse)
>Date: Mon, 23 Jul 1990 06:14:14 GMT
>Organization: The Internet
>
>>> I want to "monitor" a window on another machine from my machine.
>> If you happen to be on SUN's[sic], I have used a simple approach that
>> is not dependent upon X: "rsh <student-machine> screendump | screenload".
>
>If this sort of wholesale screen transfer is enough for your needs, you
>could use "xwd -root -display machine:0 | xwud" as an X solution.  If
>your machine has not been xhosted in, you could "rsh machine xwd -root
>-display :0 | xwud" instead.
>
>If the beeps bother you, well, you have source to xwd, and it generates
>them explicitly....
>
>					der Mouse
>
>			old: mcgill-vision!mouse
>			new: mouse@larry.mcrcim.mcgill.edu

Hi, its me again - the guy that started this discussion, etal.  From a real
world situation, being able to see what is going on another terminal is GREAT.
From an academic situation it gets tricky.  Both Jim Hopkins and der Mouse
talked about the one thing that caused me to scream about terminal monitoring,
SCREENDUMPING.  In the past I have known of students that have gotten copies
of exams from teacher's screens.  All they have to do is to do a periodic
screendump.  Simple as that.  I've even known of some teachers that have left
their exams readable (they deserved to get screwed - prof. are suppose to
w better).  Yes, there are ways around screendumping, etc.  Modify the source
(at school we did this initially), touch this touch that, restrict this
restrict that, etc.  Thats what I hate.  We shouldn't be spending our time
with issue such as security.  We should be pushing back the edges of our field
not babysitting.  Its unfortunate but that's human nature I guess.

- Mike Almquist
  HP, Avondale, PA
  almquist@hpavla.avo.hp.com