DNS

The Domain Name Service is used when a name like www.bthealthnet.com needs to be translated into a network address using the Internet Protocol (IP).

email

Electronic mail. For NHSnet users, the email service is provided by Syntegra.

Firewall

A special node in the network that can vet the messages that are being passed to ensure that only authorised users and approved traffic can use the network it protects.

HealthNet

The managed service forming BT's contribution to NHSnet.

IP

The Internet Protocol. This is a predefined messaging format which enables nodes on a network to appropriately interpret and route packets of information. The protocol enables networks managed by different companies to collaborate in the delivery of services.

NHSnet

The interconnected network for the NHS. This network is protected from the internet. It has components provided by BT and Cable and Wireless. It is managed within the NHS Information Authority under Project Connect.

Portal

A gateway that provides a focus point for access to information and services. For example, this service portal provides a focus for information and services relating to the use of NHSnet.

Router

This is placed on the nodes of the network and is loaded with information which enables it to decide which node is the next one in the chain that forms the end-to-end link for a message.

Routing

The logic loaded into routers that forms the rules for how to pass messages around the network.

Traffic

A term used to refer to the collection of messages that represent the use of a network.