Abstract: A computer-readable portable storage medium that stores information to certify access to a remote computer and a program used to utilize a remote storage device managed by the remote computer. The program executes a procedure of being driven when the medium is mounted to the local computer, determining whether the local computer is connected to the network, reading a URL of the remote computer from the storage medium, connecting the local computer to the remote computer, reading and transmitting a certification key from the storage medium to the remote computer, and registering the remote storage device as an auxiliary memory of the local computer when access to the remote computer is allowed.