This software is easy to use, as long as in the main window of the "file name prefix" enter a string, and then grasping Explorer drag and drop a file to the program's main window, she can automatically for you renamed the bulk. For example: Are you in the "file name prefix" enter a string "china_map_", then select a number of JPG file drag it to the main window of the process, these documents will be automatically changed its name to "china_map_01.jpg", "china_map_02.jpg" , "china_map_03.jpg "...... this software is free software, you can use free of charge to non-commercial purposes. However, for commercial purposes to the author to pay RMB30. You can copy, distribute the software, but must maintain the integrity of the software. Shall not be modified. If you use this software free of charge, please send the author a mail (using the lower-right corner of the main window painted mail button). Let the author some confidence.