This article describes the variables for the ServiceProvider subkeys that appear in the following registry key:

The Class and ProviderPath subkey values are used by the service resolution and registry Application Programming Interfaces (APIs) in Windows Sockets. The Class parameter indicates that Transport Control Protocol/Internet Protocol (TCP/IP) is a name service provider. Because of this, its binary value should not be changed. The ProviderPath parameter is a string variable that defines the location and the file name of the 32-bit Windows Sockets Dynamic Link Library (.dll) file. The default location of the Wsock32.dll file is in the Windows\System folder.

The following registry values are used to describe host name resolution order. A low number sets a high priority for name resolution. These settings are used for 16-bit Windows Sockets, which need to rely on the resolvers that are expected to take the least time to resolve host names. The numbers used in these examples are the default values:

•	LocalPriority = 0xF3 (499)
•	HostsPriority = 0x1F (500)
•	DNSPriority = 0x7D0 (2000
•	NetbtPriority = 0x7D1 (2001)