Actually, I'm still looking for a way to set a default domain for Windows logins. When I'm in as local admin, I have to log out and back in as domain admin so that when the user returns, the domain doesn't block or confuse them by showing the machine name instead.
Anyhow, in the case of Windows, your already entering a uname/pword/domain. Thinks like Cisco gateways that tap into MS-LDAP also ask for all three. In the end, I don't know if it provides a third dimension for calculations with any benefit over two though.
My initial thinking would be that your better to look for dual authentication at that point. Unless the domain specifies a seporate area of the same machine (eg. egroupware supporting more than one domain), you may not be adding much to what is still a single authentication login. Granted, somethignyouhave and somethignyouare become complicated where websites are concerned.
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