[snip]
> 2 - command-line execution of vncconfig.exe only applies to 
> 'user' mode not to 'service' mode
> 3 - only the rt-click : Options... will look at 'service' 
> mode config data

This is not true.  You need to supply the "-service" command-line option to
VNC Config see the Service-Mode settings.

> 4 - HKLM/Software/RealVNC/WinVNC4 lists 'service' config data
> 5 - HKU/<user_account>/Software/RealVNC/WinVNC4 lists 'user' 
> config data

These are referred to as the "Service-Mode" and "User-Mode" configurations,
mainly to avoid confusion with the Service Control Manager's configuration
entries for the VNC Server Service...

> 6 - HKLM/System/CurrentControlSet/Services/WinVNC4 has a 
> field called ImagePath which shows the command-line command 
> that was entered. 
> Interesting I guess.

This is not true.  It includes the command-line options that followed
"-register", as per the help text.

> 7 - The 'service' config info _can_ be changed directly via 
> the registry directives

Yes.  What behaviour were you expecting?

> 8 - Changes to the registry, via HKLM, appear to be accepted 
> at any time and, if the VNC icon access to config, via 
> Options..., is to be believed, the changes are live and 
> active immediately

That will depend upon the particular setting you change.  Some settings have
no effect until the server is restarted.

> So, I considered the simplified case of attempting to affect 
> a single, service-mode config parameter. However, none of the 
> following or their variants have any affect on the the Port 
> Number parm when verified via the rt-click : Options... of 
> the service icon.
[snip]

Loading the VNC Config dialog will load the settings from the registry and
display them, and optionally write them back to the registry if one or more
of the values are changed.  It has no awareness of nor effect on
command-line parameters passed to the server.

Regards,

--
Wez @ RealVNC Ltd
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