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You run applications, display information, or list files in windows A window is made up of several basic components The outer border contains resize controls Also, various buttons enable you to control the size of a window or close the window Inside the outer border are the main components of the window: the title bar, which displays the name of the window; the menu, through which you can issue commands; and the window pane, which displays the contents of a window You can change a window's size and shape using buttons and resize areas The resize areas are the corner borders of the window Click and hold a resize area and move the mouse to make the window larger or smaller in both height and width You can make the window fill the whole screen using a maximize operation.

If an error is encountered while evaluating the function given by the user an error message is displayed indicating the error, and Evaluate will return the ExprS as it was, that is, if ExprS is not a valid expression the Evaluate(ExprS) function will display an error

Most window managers include a small button in the upper-right corner that you can click to maximize the window To reduce the window to its original size, just click the Maximize button again If you want to reduce the window to an icon, click the Minimize button It's the small square with a dot in the center next to the Maximize button Once you have reduced the window to an icon, you can reopen it later by double-clicking that icon Applications that have been designed as X programs will have their own menus, buttons, and even icons within their windows You execute commands in such X applications using menus and icons If you are running an application such as an editor, the contents of the window will be data that the menus operate on If you are using the file manager, the contents will be icons representing files and directories.

Some windows, such as terminal windows, may not have menus You can have several windows open at the same time However, only one of those windows will be active On some window managers, just moving your mouse pointer to a particular window makes it the active window, rendering all others inactive You will need to click the title bars of others Most window managers let the user configure the method for making the window active..

message and return the original input without evaluation. This allows the user to check if the return result is still the same as the input then execute any error handling within the program. The error message given by the interpreter is meaningful in that it indicates the type of error, but the line number will always be 0 because ExprS is just one line any way. KeyDown(ExprN) The commands WaitKey, GetKey and GetKeyE allow you to obtain the code for the last key pressed. However, it may become necessary to test if a certain combinations of keys are pressed. Say you want to re retrorockets horizontally and vertically and allow both at the same time. If you use the above commands the program will only be able to detect the last key pressed and thus if the user presses both the Up and Left Arrow keys together the commands will only report the code of the last key pressed. Also see the Constants help page in the IDE for handy constants that represent various key codes. Using this function you can interrogate each key separately to see if it is pressed down or not. There are 255 keys on the keyboard and you can nd out the state of each separately using this function. For instance, if you want to nd out if the up arrow key is pressed and also at the same time the left arrow key then you would have a statement like

Many window managers, such as Enlightenment, Sawfish, Window Maker, AfterStep, Blackbox, and FVWM2, support themes. Themes change the look and feel for widgets on your desktop, providing different background images, animation, and sound events. With themes, users with the same window manager may have desktops that appear radically different. The underlying functionality of the window manager does not change. You can easily download themes from Web sites and install them on your window manager. New ones are constantly being added. Information and links to window manager theme sites can be found at themes.org.