Xfce with KDM ???
 

How can i use Xfce with KDM?

When the KDM login manager appears, select the Menu button. Then select the Session Type option. You should see Xfce in the list. :)

I decided to try this run level yesterday.(My third year on Slack :)). On this run level there is no need for running "xwmconfig" manually. That's great. Thank you very much.

I have always preferred to boot to the command line.

In runlevel 3 you don't have to use xwmconfig all the time. There are commands like

I had thougt that there had to be such commands like above. :) Thanks ilgar.
I have noticed that for the run level 3 there were no need to add a user to some groups such ad audio and cdrom. Without adding user to these groups one can hear sound from computer and use k3b for burning in run level 3. But after switching run level to 4, I needed to add my users to audio and cdrom groups. One can tell me advantages and disadvantages of run level 4 compared to 3 ?

This is because in runlevel 3 the login command checks the /etc/login.defs file which in Slackware contains supplementary groups like this :
effectivley adding the user to these groups when logging in.

Personally I like to always login to a console on run level 3 as I feel it gives me more control. I may want to do some stuff before X has started. This may be just a habit though..

That usually is safer anyway.

Depends. If you are playing the role of administrator then run level 3 is preferred. If you are only an end-user and accustomed to point-and-click, then run level 4 is nicer. If you are running a box used by several people, such as in a family, then run level 4 often is best. For you --- the administrator --- although you too use X most of the time, you can toggle to console 6 (Ctrl-Alt-F6), log in at the command line, and play administrator. Or use a xterm/konsole session.

For run level 3, is it possible to shut down computer just clicking on shut down button on KDE log out menu without executing console power off commands?

Possibly but I do not recall having ever read of a method for the stock KDE.

There are some third-party applets available for KDE. You might want to visit the kde-apps.org web site. They are named kshutdown and kpowersave. Perhaps those applets will do what you want from run level 3.

I think the reason no shutdown or reboot option is available is run level 3 and 4 support different presumptions. Run level 4 presumes no console and run level 3 is a console. When a person uses the KDE Logout applet, I think the Logout applet code is designed to reflect the run level.

If the run level is 4 then because there is a presumption of no console (although there might be a console available), shutdown and reboot options are available in the Logout applet dialog box.

If the run level is 3, then X is started from the console and exiting X returns a person to the console. Therefore the Logout applet provides only the End Current Session button. The presumption is a reboot or shutdown is available upon exiting X and returning to the console.

After exiting X, a user can type one of the various shutdown or reboot commands. Yet bear in mind that doing this while logged in means the bash history is not updated. But logging out to update the bash history means no shutdown command. If enabled in /etc/inittab the reboot shortcut is available (Ctrl-Alt-Del), but no shutdown shortcut. I remedied that problem by creating a keyboard shortcut of Ctrl-Alt-End. You can read more here:

Adding a Shutdown Command to inittab

I had looked at your page a few days ago woodsman, and applied your method to shut down with CTRL+ALT+END.
I installed SLiM (Simple Login Manager) and set COMPUTER run level to 4 yesterday, but now again shut down button on KDE log out menu is not active. Although computer is set to run level 4, why shut down button is not activated?

Look in the KDE Control Center, KDE Components, Session Manager, and verify the Offer shutdown options check box is enabled.

If the check box is enabled then possibly the KDE shutdown options don't function with Slim.

Check box is enabled, but shut down options do not function. Perhaps SLiM does not support this property as default.

Give the KDE Login manager (KDM) a try to at least determine whether the shutdown options appear.

I set KDM as default login manager for shutdow options. Shutdown options appeared, then i downloaded a lot of KDM themes from KDE-Look and installed on KDE. I gave up SLiM. :) I will also probably gave up KDM and come back to my favorite log in method (id:3) in the next days.