Abstract: A client executes a first application and raises a request. Accordingly, server sends a second configuration file. Client performs following steps: (a) receiving second configuration file; (b) determining whether versions of second and first application are the same, executing first application if yes, going to (c) if no; (c) determining whether second module of second application is updated, going to (d) if yes, going to (e) if no; (d) determining whether any unprocessed second module exists, going to (c) if yes, going to (f) if no; (e) connecting storage device for downloading and storing second module, and going to (d); (f) first module duplicating second module to second location; (g) first module stored in first location starting first module stored in second location; (h) ending first module stored in first location; and (i) first module duplicating second module to first location.