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KDE uses as its library of GUI tools the Qt library, developed and supported by Troll Tech (www.trolltech.com). Qt is considered one of the best GUI libraries available for Unix/Linux systems. Using Qt has the advantage of relying on a commercially developed and supported GUI library. Also, using the Qt libraries drastically reduced the development time for KDE. Troll Tech provides the Qt libraries as open-source software that is freely distributable. Certain restrictions exist, however: Qt-based (KDE) applications must be free and open sourced, with no modifications made to the Qt libraries. If you develop an application with the Qt libraries and want to sell it, then you have to buy a license from Troll Tech. In other words, the Qt library is free for free applications, but not for commercial ones. The Harmony Project is currently developing a free alternative to the Qt libraries. Harmony will include all Qt functionality, as well as added features such as multithreading and theming. It will be entirely compatible with any KDE applications developed using Qt libraries. Harmony will be provided under the GNU Library Public License (LGPL). See www.gnu.org/software/harmony for more information.
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One of KDE's aims is to provide users with a consistent integrated desktop, where all applications use GUI interfaces (see Figure 9-1). To this end, KDE provides its own window manager (kwm), file manager (Konqueror), program manager, and desktop panel (Kicker). You can run any other X Window System-compliant application, such as Netscape, in KDE, as well as any Gnome application. In turn, you can also run any KDE application, including the Konqueror file manager, with any other Linux window manager, including Blackbox, Afterstep, and even Enlightenment. You can even run KDE applications in Gnome.
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Figure 9-1: The KDE desktop When you start KDE on Red Hat, the KDE panel is displayed at the bottom of the screen. Located on the panel are icons for menus and programs, as well as buttons for different desktop screens. The button for the K Menu shows a large K on a cog wheel with a small arrow at the top indicating it is a menu. This button is known as the Application Starter. Click this button to display the menu listing all the applications you can run. The K Menu operates somewhat like the Start menu in Windows. The standard KDE applications installed with the KDE can be accessed through this menu. You can find entries for different categories such as Internet, Systems, Multimedia, and Utilities. These submenus list KDE applications you can use. For example, to start the KDE mailer, select the Mail Client entry in the Internet submenu. To quit KDE, you can select the Logout entry in the K Menu. You can also rightclick anywhere on the desktop and select the Logout entry from the pop-up menu. You can also click the Logout icon on the KDE panel located below the Lock icon. If you leave any KDE or X11 applications or windows open when you quit, they are automatically restored when you start up again. Should you just want to lock your desktop, you can click the Lock icon and your screen saver will appear. To access your desktop, click on the screen and a box appears prompting you for your login password. When you enter the password, your desktop reappears. Note You can display a menu for desktop operations across the top of the desktop screen by selecting "Enable Desktop Menu" on the Desktop pop-up menu displayed when you right-click on the desktop. You can use this menu to create new shortcuts called desktop files for applications and devices, as well as for accessing open windows or changing to different virtual desktops. You can bring up the same set of menus by clicking anywhere on the desktop background. A row of icons are displayed along the left side. These include a home directory folder icon, the Trash icon, a Printer icon, and floppy and CD-ROM icons. The Trash icon operates like the Recycle Bin in Windows or the trash can on the Mac. Drag items to it to hold them for deletion. To print a document you can drag it to the Printer icon. You can use the floppy and CD-ROM icons to mount, unmount, and display the contents of CD-ROMs and floppy disks. Tip When you use KDE the first time, you are asked to personalize your desktop using KPersonalizer. To change your settings, you can run this program again by selecting Desktop Settings Wizard on the System menu. With KPersonalizer, you can select the
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kind of desktop style you want to use, changing the appearance of your windows and menus. The KDE panel displayed across the bottom of the screen initially shows small buttons for the Application Starter, the window list, your home directory, the Help center, a terminal window, and buttons for virtual desktops, among others. The Window List icon looks like several grouped windows. It displays a list of all open windows and the desktop they are on. The Home Directory icon shows a folder with a house. Click it to open a file manager window showing your home directory. The Help Viewer icon is an image of a book. The Terminal Window icon is a picture of two computer monitors. Click this to open a terminal window where you can enter Linux shell commands. The desktop supports drag-and-drop operations. For example, to print a document, drag it to the Printer icon. You can place any directories on the desktop by simply dragging them from a file manager window to the desktop. With KDE 2.2, the desktop also supports copy-and-paste operations, holding text you copied from one application in a desktop clipboard that you can then use to paste to another application. For example, you can copy a Web address from a Web page and then paste it into an e-mail message or a word processing document. This feature is supported by the Klipper utility located on the panel. You can create new directories on the desktop by right-clicking anywhere on the desktop and selecting Create New and then Directory from the pop-up menu. All items that appear on the desktop are located in the Desktop directory in your home directory. There you can find the Trash directory, along with any others you place on the desktop. To configure your desktop, either click the Desktop icon located on the right of your panel or right-click the desktop and select the Display Properties entry. This displays a window with several tabbed panels for different desktop settings, such as the background or style.
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