sentences:  The top panel usually contains a clock/calendar and a notification area, which can double as a sort of dock, as well.The bottom panel is commonly empty by default (other than a set of buttons to navigate between desktops) due to its use in the navigation between windows (windows minimize to the bottom panel by default).Users can populate these panels with other completely customizable menus and buttons, including new menus, search boxes, and icons, with the icons in particular (called "launchers") performing functions similar to the "quick-launch" feature found in the Microsoft Windows 98–Vista taskbar.