Providing access to computer software and other files through computer and communication networks, including the Internet; computer maintenance, management, control and updating of computer software and other files on computers and computer networks via computer and communication networks, including the Internet; online services, namely leasing or providing access time to a computer data base, providing information in response to computer end-user queries, and providing interactive computer and computer software support services to individual end-users and to enterprises via electronic mail, computer videoconferencing and other individualised electronic communications