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Re: more Fedora Cookbook: VNC



... coffee hasn't kicked in yet, so coherence is optional ...

On Sat, 19 Jan 2008, Les Mikesell wrote:

> Paul Johnson wrote:
> > On Jan 9, 2008 2:54 AM, Alexander Apprich
> > <a apprich science-computing de> wrote:
> > > Robert P. J. Day wrote:
> > > >   yes, yes, it's really basic stuff but ...
> > I found this to be informative.
> >
> > I've not used vnc for about 10 years, since Windows 95.
> >
> > It works differently than I remember.  In the old days, when I would
> > use vnc, I would see the programs that were running on the other
> > system, and I'd take control of the keyboard and mouse of the other
> > system. It was handy for practical jokes where we would make people's
> > PCs do crazy stuff.
> >
> > In this vnc on Fedora, I see a blank desktop, rather than a running
> > session on the other PC.

by "blank desktop", do you mean truly blank, or just a regular initial
desktop with no clients running on it yet?  i'm assuming the latter.

> > What's the story there?
>
> Linux can run multiple sessions, so there are several ways to run
> the vnc service.  One is to use vncserver to start separate
> long-running sessions that are not attached to the console.  That
> is, you can connect, start some programs, disconnect, then reconnect
> later, perhaps from a different view and the programs will still be
> running.  Another way is to set up xinetd to start new sessions for
> each connections which will be destroyed as you disconnect. Yet
> another is with an X module that allows you to connect to the
> console session, more or less like the windows version where that
> was the only available session.

i, too, recall the days when a VNC session would take over a remote
desktop but i didn't get into that in the recipe.  i can't test this
at the moment but i'm going to hazard a guess as to how things work.

if someone is actually logged on to the remote linux system, then
they're running an X session corresponding to display :0.  when
someone on that remote system runs "vncserver", they should get a new
X session on display :1 and that's the one you're connecting to, so
that represents a new X session entirely independent from the one the
user on the remote system is actually working with.

if you wanted to grab control of their desktop, i imagine you'd have
to do something corresponding to running vncviewer and connection to
display :0.  is that even possible?  i didn't look into that.  does
any of the above make sense?  clarification, anyone?

rday

p.s.  as mike points out, it would seem that, since windows supported
only one X session in the first place, that would be the one you were
connecting to.
--

========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

Home page:                                         http://crashcourse.ca
Fedora Cookbook:    http://crashcourse.ca/wiki/index.php/Fedora_Cookbook
========================================================================


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