Netsh interface ip set dns register

Question

One of the parameters of the command Netsh interface ip set dns is register. What is its purpouse? I do not understand the explanations given in the help. Which value is set to this parameter if I set the DNS configuration of a network adapter through the Windows GUI?

Command help:

C:\Users\User>netsh int ipv4 set dns help

Usage: set dnsservers [name=]<string> [source=]dhcp|static
             [[address=]<IP address>|none]
             [[register=]none|primary|both]
             [[validate=]yes|no]

Parameters:

  Tag            Value
  name         - The name or index of the interface.
  source       - One of the following values:
                 dhcp: Sets DHCP as the source for configuring DNS
                       servers for the specific interface.
                 static: Sets the source for configuring DNS servers
                         to local static configuration.
  address      - One of the following values:
                 <IP address>: An IP address for a DNS server.
                 none: Clears the list of DNS servers.
  register     - One of the following values:
                 none: Disables Dynamic DNS registration.
                 primary: Register under the primary DNS suffix only.
                 both: Register under both the primary DNS suffix, as
                       well as under the connection-specific suffix.
  validate     - Specifies whether validation of the DNS server setting
                 will be performed. The value is yes by default.

Remarks: Sets DNS server configuration to either DHCP or static mode. Only
         when source is 'static', is the 'addr' option also available for
         configuring a static list of DNS server IP addresses for the
         specified interface. If Validate switch is yes, then
         the newly set DNS server is validated.

Examples:

   set dnsservers name="Wired Ethernet Connection" source=dhcp
   set dnsservers "Wired Ethernet Connection" static 10.0.0.1 primary

Solution

It adjusts the DNS values in the IPV4 properties for the specified interface.

netsh interface ipv4 set dnsserver "Ethernet" static address=192.168.1.1 register=primary

Sets this when viewed in Control Panel\All Control Panel Items\Network Connections:

See https://superuser.com/a/204059/576067 for more examples.