1 - After reading the position of the pen, the computer sends a signal to activate the screen (or off, depending on the color of background) found in the pixels pen position, a process known as marking paint. As the stylus moves, the computer calculates continuously its position and activates the remaining pixels. The computer pixels that differ match the position of the pen (input plane) of pixels activated by the application (Exit Plan). Note that the screen does not have two distinct levels of physical pixels LCD.
The distinction between input and output planes is logic. The same pixels are used for the input and output planes, but the operating system which of the two search logical planes of pixels are being used.
2 - When the pen ends touching the screen, the computer operating system passes a description of twist to
application, which compares the pattern traced by the pen with a collection of other recognized standards. The program does concessions to the combinations not so exact that the pattern drawn by the pen may be inaccurate within certain limits.
3 - When the application is the pattern that resembles one of your patterns already stored, it considers the context where the pen was. For example, an X inserted a blank space in the context of written words is interpreted as the letter X. If, however, X is inserted on an existing word, the application interprets the pattern as a word to be deleted. In the context of the check box, the application translates the X and fill in the check box.
4 - The application deletes the image pixel in the input plane and replaces it by the standards of pixels in the output plane that Interpretation of the patterns match by the program.
Source: Evolution of Computers
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