How does a news server work?

Every service or group of services that the cluster runs use resources of the cluster nodes. Every service or a group of services has its own Harddrive assigned to it (which is shared with the other failover cluster nodes), it has its own IP Address and it has its own Network name. All of the resources that a clustered service use are called a Resource Group. The Resource group contains the basic resources that every service need, Disk Drive, IP Address, Network Name, and the service itself. All of those together form a virtual server that can be moved from one server to another in a matter of seconds (Failover) without any dependence in a specific server. The user that accesses this virtual server will be exposed to it like any other server, If it is a File server, Web Server, DHCP/DNS/WINS server, Exchange Server, SQL Server or any other Windows service.