The document discusses the 6NET project, which built and operated an IPv6 network across Europe to test IPv6 applications. It provides an overview of the 6NET network topology and details several applications that were tested over the network, including video conferencing using GnomeMeeting and OpenMCU, SIP voice calls using SIP Express Router, and IPv6 streaming demonstrations. The goal of the project was to gain experience with IPv6 and help drive further deployment through testing interoperability and applications.