This document discusses terminal services and fast user switching. It defines terminal services as allowing multiple users to log onto a Windows machine simultaneously, with only one user able to see their desktop at a time. Fast user switching is described as allowing users to switch between user accounts on a single computer without quitting applications or logging out. The document provides information on how terminal servers are used to centrally host and publish applications to remote devices. It also discusses terminal licensing and provides instructions for disabling fast user switching and switching users on Windows and Windows 10 computers.