Tony,

> >From this I'm assuming that the viewer is only used to 
> communicate in "User Mode" and that a browser is only used to 
> communicate in "Service Mode". Sorry to all those experts who 
> are now falling about laughing but it wasn't obvious to me 
> and I still don't know if this is correct. But it works for 
> me as they say.

This is incorrect.  The Java and native VNC Viewers are interchangeable.
The most common cause of issues with the Java Viewer is the use of a
separate port for serving the Java Viewer from the one used for the VNC
protocol.

> OK moving on !!! So I now had connection (for a shot time at 
> any rate). The problem was that having run the viewer on my 
> PC it was causing my Laptop - running the server (in User 
> Mode :o) ) - to "blue screen" and re-boot. Not exactly a 
> practical solution to remote access.

This shouldn't happen.  Which platform is your laptop running?  Basically,
there is no way that any application should be able to blue-screen your
machine unless the operating system or drivers are broken in some way.

> Firewalls - I had my gateway firewall enabled and the XP and 
> Norton Internet Security Firewalls disabled on both the 
> laptop and PC. I have reactivated the NIS with no adverse 
> effect and for those who have come across it I have NOT had 
> to remove port 80 from the list of scanned ports in NIS - 
> although this may be an issue when I connect through the 
> Internet and my gateway.

Port 80 is not used by the VNC protocol, by default, nor to server the Java
Viewer.

> Window XP issues - I have disable "Fast User Switching" but 
> thinks still work with it enabled provided I log out of each 
> user - I have multiple users on each machine - so in effect I 
> don't use the facility.

Yes.  We tend to recommend turning it off entirely purely so that you don't
try to connect in to your XP box and find it won't work because somebody
else has FUSed it, or that you don't connect in and forget about FUS and
lock yourself out.

Related to that, an XP compatibility module is in development.

Cheers,

Wez @ RealVNC Ltd.
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