Abstract: An exemplary electronic device used for a synchronous control system includes an input unit, a communication unit, a storage unit, and a control module. The input unit includes at least one key including a unique key code. The storage unit stores a code table recording key codes of each of the at least one key. The control module executes the function associated with a key or a key combination manipulated by a user, and determines the key code associated with the key or the key combination. The control module further transmits the determined key codes to other electronic devices to control the other electronic devices to also execute the same instruction as the corresponding instruction associated with the determined key code associated with the key or the combination. A related method is also provided.

Abstract: An electronic reader includes a storage unit configured for storing files and a processor. The processor includes a file display control module, a first file creating module and a second file creating module. The file display control module is configured for obtaining and displaying the files opened by user input. The first file creating module is configured for creating temporary files recording the comments and the amended sections of the opened files in response to user input. Each of the temporary files corresponds to one of the opened files. The second file creating module is configured for combining contents of the temporary files into a file. The contents of the temporary files are arranged in the file according to a predetermined rule if the formats of the temporary files are the same.