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In most shared databases, different people perform different tasks. The easiest way to keep everyone on the right track is to create several distinct front ends, one for each group of people. This lets you gently guide people along in the tasks they perform.
However, customizing the front end doesn't restrict the abilities of a determined troublemaker. In a large company that relies on a multiuser database, you don't just think about guiding people—you also worry about restricting them.