The KDE panel is also known as Kicker. It is modular and consists of the following components:
Applets
Application buttons
Special Buttons
By default, the panel contains the following applets:
Pager - shows the virtual desktops
Taskbar
System Tray
Clock
and the following special buttons:
KDE menu
Desktop Button
Various application buttons are also added, space permitting:
Home Button
Browser Button
KMail Button