Without specialization rules, a manager reads requests to start any concurrent program.
Using specialization rules, you can specialize a manager to read only certain kinds of requests to start concurrent programs, for example, only requests to start Oracle General Ledger programs, or only requests to start programs requested by the user "Fred". See: Concurrent Managers.
A special type of specialization rule is the combined specialization rule, that can combine more than one action to define a single rule. See: Combined Specialization Rules.
Examples - Using Specialization Rules
Defining Combined Specialization Rules
Controlling Concurrent Managers
Concurrent Managers field help