Dynamic DNS Update Client
Whilst DNS lookups read DNS data, DNS updates write them. Both workstations and servers running Windows attempt to send Dynamic DNS update requests to DNS servers.
Workstations running Windows attempt to register their names and their IP addresses with DNS servers, so that other machines may locate them by name. Prior to Windows Vista (and Windows Server 2008) this registration is performed by the DHCP Client service. It is thus necessary to run the DHCP Client service on pre-Vista machines, even if DHCP isn't being used to configure the machine in order to dynamically register a machine's name and address for DNS lookup. The DHCP Client service registers name and address data whenever they are changed (either manually by an administrator or automatically by the granting or revocation of a DHCP lease). In Windows Vista (and Windows Server 2008) Microsoft moved the registration functionallity from the DHCP Client service to the DNS Client service.
Servers running Microsoft Windows also attempt to register other information, in addition to their names and IP addresses, such as the locations of the LDAP and Kerberos services that they provide.
Read more about this topic: Microsoft DNS
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