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| == Startkde Script ==
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| The KDE startup sequence starts with the '''startkde''' script. In most cases this
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| script gets called from the display manager (KDM) once the user has been authenticated.
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| There are two very important lines in the startkde script:
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| <code>
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| LD_BIND_NOW=true kdeinit +kcminit +knotify
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| </code>
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| and
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| <code>
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| kwrapper ksmserver $KDEWM
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| </code>
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| The first line starts the kdeinit master process. This process is used to start all other
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| KDE processes. The arguments behind kdeinit are the names of additional services to be started.
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| The '''+''' indicates that kdeinit needs to wait till the service has finished.
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| The second line asks kdeinit to start the ksmserver session manager process.
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| The session manager determines the lifetime of the session. When this process exits, the user is logged out.
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| == Background Services ==
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| All KDE background services are user specific, unlike system daemons they are not shared between users.
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| Apart from being unique per user they are unique per X-server display as well.
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| === kdeinit: Kicking Everything Off ===
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| kdeinit is used to start all other KDE programs. kdeinit can start normal binary program files as well
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| as kdeinit loadable modules (KLMs). KLMs work just like binary program files but can be started
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| more efficiently. The drawback is that programs started this way appear as ''kdeinit'' in the output
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| of <tt>top</tt> and <tt>ps</tt>. Use <tt>top -c</tt> or <tt>ps aux</tt> to see the actual program name.
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| For example:
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| <code>
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| > ps aux
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| waba 23184 0.2 2.1 23428 11124 ? S 21:41 0:00 kdeinit: Running...
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| waba 23187 0.1 2.1 23200 11124 ? S 21:41 0:00 kdeinit: dcopserver --nosid
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| waba 23189 0.2 2.4 25136 12496 ? S 21:41 0:00 kdeinit: klauncher
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| waba 23192 0.7 2.8 25596 14772 ? S 21:41 0:00 kdeinit: kded
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| waba 23203 0.8 3.4 31516 17892 ? S 21:41 0:00 kdeinit: knotify
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| </code>
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| <tt>kdeinit: Running...</tt> indicates the master kdeinit process. The other processes listed
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| are programs started as KLMs.
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| When kdeinit starts for the first time it will launch klauncher and kded, as well as any additional
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| programs specified on its command line in the startkde script. Normally that is kcminit and knotify.
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| === dbus-daemon: Inter-process Communication ===
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| dbus-daemon is a background process (daemon) which provides inter-process communication (IPC) facilities to all KDE
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| applications as well as several other system components, such as HAL, network manager, power manager and various non-KDE desktop applications. It is a cross-desktop, portable IPC project which is hosted at freedesktop.org.
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| D-Bus facilities are accessible from the command shell via the qdcop command line tool and can be explored using the graphical dcop-viewer application. D-Bus is essential for all KDE applications and should autostart when requested.
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| === klauncher: Service Activation ===
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| klauncher is a deamon which is responsible for service activation within KDE. It operates in close connection with the kdeinit master process to start new processes. KDE applications communicate with klauncher over the D-Bus in order to start new applications or services.
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| === kded: Background Services ===
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| kded is a generic KDE daemon. It has the ability to load various service modules and run these in the background. Each kded service module is described by a .desktop file installed under {{path|$KDEDIR/share/services/kded/}} The '''Service Manager''' in the Control Center can be used to
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| monitor the status of the service modules and to disable certain services.
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| === kcminit: Initialization Services ===
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| kcminit executes initialization services during startup. Initialization services are specified in the .desktop files of applications or services via the X-KDE-Init line. Initialization services are typically used for initializing hardware based on user specified settings.
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| <tt>kcminit --list</tt> can be used to show all initialization services and <tt>kcminit <service></tt> can be used to execute a single service explicitly. This can be useful when investigating start-up problems.
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| === knotify: Notification Services ===
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| The primary task of <tt>knotify</tt> is to relay notifications to appropriate sub-systems. For instance, sound alerts are sent to the sound system, visual alerts are showed on-screen using passive popups or dialogs, logged messages are written out to disk, etc. The actions are user configurable and support user interaction.
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| === ksmserver: Session Management and Autostart ===
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| {{improve|When the fd.o autostart spec is finalized and implemented in KDE4, update this section}}
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| <tt>ksmserver</tt> is KDE's session manager. On startup the session manager starts auto-start applications and it restores applications from the previous session.
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| The applications to auto-start are indicated by .desktop files in the {{path|$KDEDIR/share/autostart}} directory. Auto-start of an application can be made conditional upon the '''X-KDE-autostart-condition''' entry in the .desktop file. The {{path|ktip.desktop}} file for example contains:
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| <code>
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| X-KDE-autostart-condition=ktiprc:TipOfDay:RunOnStart:true
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| </code>
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| This means that the '''ktiprc''' configuration file is checked for a '''RunOnStart''' entry in the '''[TipOfDay]''' section. If no such entry is found, '''true''' is assumed, which means that ktip is one of the applications that is auto-started by default.
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| {{improve|This may change in KDE4. Check back closer to release.}}
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| There is an additional auto-start directory, {{path|$KDEHOME/Autostart}} that is sourced later. Note that this autostart path differs from the {{path|$KDEDIR/share/autostart}} directory used by the session manager. While {{path|$KDEDIR/share/autostart}} must contain .desktop files, $KDEHOME/Autostart may contain all kinds of files. The files will be opened as if they were clicked upon by the user.
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| The KDE session manager also restores one of the previous sessions. A session contains of a collection of applications as well as application specific information that reflects the state of the applications at the time the session was saved. Sessions are stored in the {{path|ksmserverrc}} configuration file and contains references to application specific state information. The application specific state infomation is saved in {{path|$KDEHOME/share/config/session}}.
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| For example if ksmserverrc contains:
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| <code>
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| restartCommand1=kwin,-session,110a0a0002000106760689100000019360000_1083342151_608625
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| restartCommand2=konsole,-session,10378ac070000108334204700000277690000_1083342151_552722
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| </code>
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| Then the application specific state information for <tt>kwin</tt> and <tt>konsole</tt> can be found in
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| <code>
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| $KDEHOME/share/config/session/kwin_110a0a0002000106760689100000019360000_1083342151_608625
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| </code>
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| and
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| <code>
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| $KDEHOME/share/config/session/konsole_10378ac070000108334204700000277690000_1083342151_552722
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| </code>
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| respectively.
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| The state information of kwin contains the location of the application windows of all the other applications in the session.
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| == Desktop Components ==
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| The three major components of the desktop are the window manager, command executer and workspace (desktop and panels).
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| === kwin: Window Manager ===
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| The window manager is always started by the session manager as part of the session restoration.
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| The window manager is responsible for managing all the windows across the virtual desktops,
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| including initial placement, minimizing, maximizing, raising, lowering of the windows and
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| focus switching between windows.
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| By default, KWin is started as the window manager in a KDE session. This can be overriden by defining the <tt>KDEWM</tt> environment variable to be name of an alternate window manager.
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| === krunner: Run Dialog, Task List, Screensaver ===
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| <tt>krunner</tt> is auto-started by the session manager by means of {{path|$KDEDIR/share/autostart/krunner.desktop}}. It is responsible for activating the screensaver, application start feedbackand the Run Command (Alt-F2) dialog, the task list window and is meant to run for the lifetime of the session.
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| === Plasma ===
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| {{improve|when plasma enters the start up sequence document it here.}}
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| KDesktop is auto-started by the session manager by means of {{path|$KDEDIR/share/autostart/plasma.desktop}}
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