one monitor with a giant screen

Hello community;

I have very important point, and I would like to have some help.

I have two monitors per operator station over a giant screen and the installation there is the surveillance camera which should be monitored through an application that will be installed on the operators stations.
the client requests that the first monitor will be dedicated to the supervision and the giant screen will always be dedicated to the surveillance cameras i did some modification at User Ref file I did the test with both monitor this market but when I use a single monitor with géant.il displayed on the monitor and the deltav always gray giant screen and when I launch the application of the camera it opens but as shown in the background.

thanks for your help.

Best regards.

Butler faith.