# Video Wall Mode

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Video Wall mode lets you use a session of the Nx Witness Desktop Client to remotely (via a LAN, WAN, or internet connection) control display on other monitors in your System. This feature is only available on Windows.

A special Video Wall License is required (see "Nx Witness Licenses"). Each license allows Video Wall control from one Client session and Video Wall display on up to two monitors (so, for example, 4 licenses allow you to display Video Wall on 8 monitors and control it from 4 Clients, concurrently).

Note: To be able to configure and control a video wall, a user must be assigned the related permission.

Video Wall Architecture

A Video Wall Server is the computer that hosts the main database of a Video Wall Cluster. Video Wall displays can be connected to this server and it can act as the Video Wall Processor as well. All computers that are part of the Video Wall Cluster (clients and controllers) should be located in the same network.

The Video Wall Processor is the computer that Video Wall displays are connected to. Depending on its configuration it can handle one or several displays. There is not a limit to the number of Video Wall Processors that can be combined in a Video Wall Cluster.

A Video Wall Controller is any computer that can connect to a Video Wall and control it. It can even be a laptop; the only requirement is that the video adapter should support OpenGL > 2.0.

In order to operate Video Wall properly, Nx Witness should be installed on every computer in the Video Wall Cluster:

•Video Wall Server: Full installation.

•Video Wall Processor(s): Client only installation.

•Video Wall Controller(s): Client only installation.

If all Video Wall components are installed on one computer, choose Full installation.

Initial Video Wall configuration is performed in several steps:

•Configuring a Video Wall Display

•Switching to Video Wall Mode

•Controlling Video Wall Displays

You can also Delete a Video Wall or it's Elements, or Push an Operator's Screen to a Video Wall.

The number of displays available to any single computer is limited by the number of video outputs it has. To extend Video Wall it is necessary to add additional computers and combine them with the Video Wall Cluster. See "Configuring Video Wall on Several Computers".