Brother DCP-315CN Network User's Manual page 32

Primary WINS Server IP Address
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This field specifies the IP address of the primary WINS (Windows
Internet Naming Service) server. If set to a non-zero value, the
machine will contact this server to register its name with the
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Windows Internet Name Service.
Secondary WINS Server IP Address
This field specifies the IP address of the secondary WINS server. It
is used as a backup to the Primary WINS server address. If the
Primary server is unavailable, the machine still can register itself with
a secondary server. If set to a non-zero value, the machine will
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contact this server to register its name with the Windows Internet
Name Service. If you have a primary WINS server, but no secondary
WINS server, simply leave this field blank.
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