CAL users - 1 or many?

If you have an application that uses a single SQL logon to access the database, but that application is used by many people to access the database, do we require one CAL (for the app) or many (for each user)?For server/CAL licensing the licence agreement requires that you purchase a
licence for each user or device using the server. A user is an actual
person, not a login. That's my understanding.
From the licensing FAQ:
"A user CAL allows a particular user to gain access to licensed server
software from any number of devices."
http://www.microsoft.com/sql/howtobuy/faq.asp
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David Portas
SQL Server MVP
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