A method and system thereof for updating applications installed on a computer system. Each application supplies the name of a source (e.g., a Web site address) from which updates can be obtained. Upon boot up, the boot loader reads the addresses, locates the interface for connecting with the Internet, and connects with each of the Web sites. Updated application information is identified and can be downloaded from the Web sites to the computer system. Also, information can be downloaded to change the graphical user interface for the application. Furthermore, the Web site can determine whether the application is authorized for use on the computer system. Alternatively, a single Web site can be used for multiple applications. In addition, this process can instead be implemented as a background function after boot up. In each implementation, applications are conveniently and reliably updated without having to execute the applications.