A French-language technical volume on extranets, this work addresses the use of networked systems to connect organizations with partners, suppliers, clients, and other authorized external users. Written for readers interested in the practical side of digital communication infrastructure, it examines how extranets extend internal information systems beyond a single company while maintaining controlled access and secure exchange. The title reflects a period of rapid development in Internet-based business tools, when organizations were beginning to adapt web technologies for collaboration, document sharing, and remote services. As a concise technical publication, the book is best understood as a professional or educational resource on networked information systems rather than a work of fiction or general popular history.