spacedesk expands the Windows desktop computer screen to other computers over the local area network. The spacedesk server runs a Windows service and the WDDM Filter Hook Display Driver which is visible to Windows just as additional virtual monitors on the primary video card. These additional virtual displays can mirror the main screen or extend the Windows Desktop. spacedesk server software is capturing their screen content, compressing it and transmitting it over the LAN (Local Area Network) to the spacedesk clients.