mulitple displays not working

[James Weatherall]

Andrew,

The VNC "Display Number" does not have anything to do with the physical
displays attached to your Windows PC, but is simply used to determine which
port to accept VNC connections on.

Making only the primary display available remotely is a characteristic of
any VNC 3.3 based software, which TightVNC is one example of.

VNC 4 works correctly with multiple monitors, making the entire desktop
(i.e. all monitors) available remotely.

VNC Enterprise Edition provides the functionality of VNC 4, but can alse
remote individual monitors, via the DisplayDevice registry setting.  You
would set this, for example, to "\\.\DISPLAY3" and VNC Server would then
make only display 3 available rather than the entire virtual desktop.

Regards,

Wez @ RealVNC Ltd.


> -----Original Message-----
> From: vnc-list-admin "at" realvnc.com 
> [mailto:vnc-list-admin "at" realvnc.com] On Behalf Of Boswell 
> Andrew Dr (ITCS) s139
> Sent: 18 November 2004 16:36
> To: 'vnc-list "at" realvnc.com'
> Subject: mulitple displays not working
> 
> Dear All,
> 
> We are having this problem with TightVNC, but I think it is 
> more or less the same as RealVNC.  We use VNC in conjunction 
> with an Access Grid indtallation.  Our Access Grid PC has 4 
> displays (0 is the PC console, 1,2,3 are the projectors).  
> 
> I want to run a Powerpoint (or any application) onto display 
> 3 (ie screen/projector 3) and then connect using TightVNC 
> from other sites (my test PC at moment).
> 
> This is what I get: 
> 1) connect to 123.45.67.89 (our AG machine)
> 	- display 0 (ie the IGCube monitor) is opened - as expected
> 2) try connecting to 123.45.67.89:3
> 	- VNCViewer returns "can't find server" or similar
> 3) open up VNCServer config and set it to display 3
> 	- VNCViewer now connects to "123.45.67.89:3"
> 		BUT displays the IGCube monitor (ie display 0 
> not display 3)
> 	- VNCViewer returns "can't find server" for 123.45.67.89
> 	(ie all this has done is made some internal VNC name 
> for display 3 which still really refers to display 0). 
> 
> 4) OK, so, I open up Control Panel / Display and set display 
> 3 to be the primary (or similar) display.  System does nasty 
> things as expected to open windows and opens new apps on 
> display 3, but when I then connect to
> 123.45.67.89 VNCViewer displays display 3.
> 
> 4 is not a workable solution as we operate our AG on display 
> 0 (ie not projected onto our screens) usually.  I just did 
> that to prove that VNC connects to primary display, and 
> doesn't see the others.  
> 
> I don't think this is firewall as I have configured Kerio on 
> this machine, and my test (VNCViewer) machine is in the same sub-net.
> 
> Any suggested fixes / workarounds?
> 
> Thanks
> 
> Dr Andrew Boswell	        
> Senior System Developer and e-Science Consultant               
> IT and Computing Services 		email : A.Boswell "at" uea.ac.uk
> University of East Anglia		phone : +44-1603-592349
> Norwich, NR4 7TJ, UK	  		fax   : +44-1603-593467
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