A node is an individual system connected to the network. This can represent an organisation, part of an organisation or even an individual. The node can be run off the back of a web-site, enabling groups of organisation to connect their sites together on a common network.
Information and Network Services on nodes are managed by the individual organisation. Nodes also provide a means of accessing information on the network; used as a gateway they allow information to be displayed on (for example) the Web.