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X display manager
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<p>In the <a href="/facts/X_Window_System/ac2vRIQL">X Window System</a>, an X display manager is a graphical <a href="/facts/Login_manager/rGI9DXyp">login manager</a> which starts a <a href="/facts/Login_session/plmwnSNU">login session</a> on an <a href="/facts/X_Window_System/ac2vRIQL">X server</a> from the same or another <a href="/facts/Computer/SQe1aK05">computer</a>. </p> <p>A display manager presents the user with a <a href="/facts/Login/xNRgTVnV">login screen</a>. A session starts when a user successfully enters a valid combination of <a href="/facts/Username/zQRzG0KG">username</a> and <a href="/facts/Password/WEoul230">password</a>. </p><p>When the display manager runs on the user's computer, it starts the X server before presenting the user the login screen, optionally repeating when the user logs out. In this condition, the DM realizes in the X Window System the functionality of <a href="/facts/Getty_(Unix)/gw3FM805">getty</a> and login on <a href="/facts/Computer_terminal/fSlx05qV">character-mode terminals</a>. When the display manager runs on a remote computer, it acts like a <a href="/facts/Telnet/hxT0e85h">telnet</a> server, requesting username and password and starting a remote session. </p><p>X11 Release 3 introduced display managers in October 1988 with the aim of supporting the standalone <a href="/facts/X_terminal/3vKnajqT">X terminals</a>, just coming onto the market. Various display managers continue in routine use to provide a graphical login prompt on standalone <a href="/facts/Computer_workstation/h5tK4hTt">computer workstations</a> running X. X11R4 introduced the X Display Manager Control Protocol (XDMCP) in December 1989 to fix problems in the X11R3 implementation. </p>