Make loopback VNC Viewer window inactive / disappear

[trismarck]

Hi,
I wanted to create something like a big virtual desktop with UVNC. I have two computers, one (Toshiba1) acts as a server (and a client through loopback connection) and the second one (Toshiba2) which acts as a client. What I want to do is to connect with VNC from both clients to the server and switch both clients to "Show primary and extended screen at the same time" option, to be able to scroll through one "virtual desktop" with two computers / monitors. Unfortunately, when I do it on the server (Toshiba1) using the loopback option, the VNC Viewer window shows only nested server screens instead of the actual server screen contents. Is there any way to 'fix' it (make VNC Viewer not see the VNC window)?
I don't know whether this post is concise enough so you could understand me, I can illustrate what I mean on a picture if you would like.
Regards.