Reviews the Internet and intranets, private communications networks within organizations. Examines extranets (organization's intranet offering password-protected external customer and supplier access to selected portions of its intranet) highlighting the viewpoint of librarians. Discusses extranet issues (security, access, user satisfaction),…

Describes a security architecture, Oasis, which runs on a middleware platform extended for asynchronous operation; shows how the interoperation of independently developed services may be supported under the Oasis architecture. Uses the provision of digital academic library services as an example. (Author/AEF)