>>I will be building an n-tier app based on Windows NT and SQL server using a browser and plain HTML as the front-end.
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>>Is there a special licensing for both of these products if users won't be authenticating? Also, would any of the users need to authenicate or have the NT or SQL client loaded other than me the developer? And thirdly, how are users authenticated (ie put in their user name and password) in an n-tier application? Is this passed off to SQL Server or NT or does the application take care of this?
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>Just a note. This app will be on an intranet for now, and not exposed to the internet.

You'll need SQLn Server Enterprise, and Internet licensing from what I can tell - that adds about $3K per server processor to the cost of SQL Server. IOW, if you have a 4 processor server, you need 1 copy of SQL Server Enterprise + 4 Internet processor licenses.