Patent ID: 8646058

Claim:
A computer system comprising: a network ( 100 ); a server computer ( 110 , 120 ) connected to the network; a plurality of client computers ( 11 , 12 , 21 ) connectable to the network; and portable information recording media (R 11 , R 12 , R 21 ) issued respectively to individual users for use upon connection to the client computers; wherein a unique identification code (ID( 11 ), ID( 12 ), ID( 21 )) is recorded in each of the client computers ( 11 , 12 , 21 ) so as to enable distinction from other client computers, an identification code (ID( 11 ), ID( 12 ), ID( 21 )) that corresponds to a specific identification code recorded in a specific client computer is recorded in each of the portable information recording media (R 11 , R 12 , R 21 ) issued to the individual users, and each of the client computers ( 11 , 12 , 21 ) comprises an interface means ( 11 D) for connecting a portable information recording medium (R 11 , R 12 , R 21 ), an identification code comparing means ( 11 C) that compares an identification code recorded in a currently connected portable information recording medium (R 11 ) and an identification code recorded in the client computers, an access right setting means ( 11 B) that sets a predetermined access right based on a comparison result obtained by said identification code comparing means, and a server access means ( 11 A) that performs access to the server computer within a range of the access right that has been set by said access right setting means.