i may have misunderstood... but if not, then it is definitely possible to do what you want.
a NIS server, or an LDAP server, or another form of authentication server will perform the tasks you are looking for i think.
For example, a NIS setup could mean that your NIS server is serving password maps to all the client machines, so when you type in a username and password, it looks to NIS for information, and if it can't find any, it looks locally.
This means that if you have 20 machines, each user doesn't have to change their password 20 times... you just update the central NIS server.
is that roughly what you were looking for?
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