VNC with dual display

Is it possible to setup VNC to use it in a dual display computer?

How can i do it?

I need to give remote assistance to my users, I need to let them watch what I do on their computers.

I wish to use free software (I heard about Real VNC but i know it must be paid for business)

Up to now I'm using this solution https://access.redhat.com/knowledge/solutions/7096 to start vnc as soon the computer boots.

It works fine. Now i only need to let vnc-server-module to remotize both displays.

On this (https://access.redhat.com/discussion/start-vino-boot ) thread  you can see how my xorg.conf file looks like up to now, with a single display computer.

Thank you.