KDM
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In computing, KDM (KDE Display Manager) is a graphical login interface for computers using Unix-like operating systems. It is the K Desktop Environment replacement for XDM, the default X display manager. KDM allows users to pick their session type on a per-login basis. It uses Qt, like KDE and can be configured from the KDE control center. It also allows theming and user photos.
A simple KDM login dialog box has a list of users on the left, stating their username, their "real name" and optionally also containing a small picture that can be chosen by the user or the administrator. To the right from the list is a greeting and a picture. These items can be customised using the KDE Control Center, you may also replace the picture with an analog clock. Under the picture/clock are the Username and Password text boxes. These are self-explanatory. On some systems, you will find a session selector under the password field where you can select the kind of session type you want to start, e.g. KDE, GNOME or a simple terminal. At the bottom, there is a series of buttons which offers commands to shutdown and reboot the computer, restart the X server or start a tool to manage users.