Compared with the command-line interface used by early computers, the graphical interface is more convenient and easy for users. The extensive application of GUI is one of the great achievements of the development of computer. It greatly facilitates the use of non professional users who no longer need to memorize a large number of commands by rote. Instead, it is convenient to operate through windows, menus, buttons and other ways. The embedded GUI has the following basic requirements: light, less resources, high performance, high reliability, easy to transplant, configurable and so on.<br>
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