The multi-monitor display extension app, spacedesk lets you use other devices and computers on your LAN (Local Area Network) as monitors for your Windows desktop. At least 2 machines are needed to operate spacedesk. These machines are connected via a network and running two different software programs:

The Primary Machine is a Windows PC, laptop or Surface Pro tablet. It runs the spacedesk DRIVER software. It includes network display server software and display device drivers. This allows to extend or duplicate the Windows Desktop to the screen of another machine over the network.

The Secondary Machine runs spacedesk VIEWER program which acts as the secondary display. It can be one (or multiple) of the following: - Android tablet or phone (Android VIEWER) - Windows PC, laptop or Surface Pro tablet (Windows Desktop application) - Apple Mac, iPad or iPhone (iOS VIEWER) - Linux PC and a variety of other machines (HTML5 VIEWER)