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Here are some definitions of N-Tier Software.
?An n-tier application program is one that is distributed among three
or more separate computers in a distributed network. The most common
form of n-tier (meaning 'some number of tiers') is the 3-tier
application, in which user interface programming is in the user's
computer, business logic is in a more centralized computer, and needed
data is in a computer that manages a database.?
?TECHNICALLY SPEAKING?
http://www.opensolutionsinc.com/resq_architecture.htm
?N-tier application structure implies the client/server program model.
Where there are more than three distribution levels or tiers involved,
the additional tiers in the application are usually associated with
the business logic tier.?
?Application Architecture Glossary?
http://www.techarch.state.ar.us/domains/application/overview/glossary.htm
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