Listening to two Servers at once

[Andrew Borland]

James Weatherall wrote:
> The number of servers you can connect to a single listening viewer is
> limited only by system resources.  You don't need to run multiple viewers.
>

Thanks Wez.  It would appear that RealVNC is even cleverer than I was 
already giving it credit for.

However, I fail to understand how the Viewer can distinguish between the two 
Servers appearing to originate from the same IP address (namely that of the 
remote router) and arriving on the same port.  I can only presume there is 
some other "port magic" going on in the background.

Regards,  Andrew Borland (UK)