When Windows people talk about domain vs workgroup accounts, think of it like this. Each and every Windows OS running in the world is a domain in itself. You have to have the account and password to access the resources on that OS. Even if you have 100 Windows OS’s in a workgroup the same user name and password on every one of them, you still have 100 separate user accounts.
When this computer belongs to a domain, when you add that Windows OS to the domain, the domain controller holds the account and is used on all the Windows OS’s that belong on that domain.
In other words, if the 100 computers are on the domain, you can set one account that can be used on all 100 computers. If you change the password once on the domain account, you can still get into each of the 100 computers. If they are in a workgroup, you have to change it 100 times! But that is where having the workgroup on a network is beneficial, you can change the account on all 100 computers via any one of them that are connected. They sell tools for just this kind of networking…