There can only be a single active window at a given time and, in general, the The active window is the one that is visually above the other windows (there may be some exceptions).
The active window is the one that will receive most of the instructions that are sent from the keyboard.The keyboard will be reflected in some way in the window in focus.Of course, some keys or key combinations will be answered by the operating system and not by the active window.
Depending on the operating system, there will be different ways to indicate to the user when a window is active and when it is not.The way to indicate that a window is in focus also changes depending on the version of the operating system and the theme, effects and colors that are being used.
The windows can be thought of as one above the other.This order is called Z-order, which is measured numerically from the bottom forward.The window with the Z-order with the highest number will be the one that is active.
Windows active in windows
In Windows an active window has a title bar of a different color than a background or inactive window; generally the active window has a more vivid title color (e.g.a blue one) and the inactive one has a more muted color (e.g.a gray one).In more current Windows, such as Windows 10, this difference is sometimes more subtle (always depending of the Desktop theme or appearance we choose), just change the color of the title text of the title bar (e.g., black text when it is active or gray text when it is inactive).
Also the Windows taskbar helps to detect which window is active and which is not; the button (which has an icon and the name of the window) of an active window will be a different color from the rest of the buttons that correspond to other inactive windows.
In the image you can see three windows: In the WordPad background, in the middle a Notepad and in focus or activate another Notepad.You can see the color difference in the title bars, as well as the very thin edge of the active window that is of another color.Also, depending on the Windows that is used, the windows that are in front of others will generate shade to the windows that are behind.
Finally in the image you can also see the taskbar that is active ( highlights from the rest) the button that corresponds to the active and inactive window to those buttons that correspond to inactive windows.
How to turn a window active or in focus
Windows without doubts is the one that marks "de facto standards" for the methods of graphic user interface control in sist operational emas.In any case there are sometimes differences with other graphic operating systems.
General methods to return activates a window:
-Click on the window we want to activate.
-Pressing the ALT + TAB key combination until you find the window you want to focus on.
-Minimizing or closing the current active window, the window immediately behind it will be automatically activated.
-Click on the icon and name that corresponds to a specific window in the taskbar, activate that window.At Apple this bar is called dock.
-En some operating systems (as is the case of the FVWM system) simply by moving the mouse cursor over a window will activate it, there is no need to click.
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