The K Menu is one of the central elements of Kicker.
There are five main groups in the K Menu which will be described now from bottom to top.
This group is for the common KDE things in the K Menu.
This entry is used to finish the KDE session. It also shuts down the X Window System™.
With this entry you can lock your screen if you don't want anybody else to see your desktop. If you have set a screensaver, it will appear when locked, otherwise the screen will turn black. If you hit any key, you will be prompted for your user password. This is independent from the screensaver's password settings.
In this submenu you can change the settings of Kicker, described in the Configuring Kicker section, add things to Kicker (see in Kicker Basics for more) and start the Menu Editor. You can also reach the Help Menu, but as you are reading this, you probably found it yourself.