Second, you register workgroup name rather than domain name because browsing functions, such as Network Neighborhood, are built around workgroups, not domains. To control whether your computer agrees to be a potential browser, set the Registry entry MaintainServerList to either Auto or Yes. But all the master browsers in a network's subnets must be able to share information, so one master browser becomes Domain Master Browser, the head bull moose of browsers in a workgroup. Because each workgroup has its own domain master browser. On my network, for example, we have five domains.
Domains also use group names.
I said earlier that one way to think of a NetBIOS name is as the machine name that you give a networked computer. Microsoft describes these names as being owned by the redirector or workstation service. Microsoft networking lets you log on as many times as you like to as many machines as you like. Failing to register the name means that if you're simultaneously logged on to several machines, you won't necessarily receive any Net Sends or network alerts sent to your name at the machine where you're currently sitting. I hope these explanations make WINS output a little more readable.