# Guide to OpenIG
2.2. How It Works In Detail

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### 2.2.4. Chain

A Chain is a combination of one or more Filters and a handler that process an incoming request from the Dispatcher. For example, the Dispatcher can process an incoming request with a URL parameter of `action=login` and forward the request to the Login Chain. The Login Chain executes a list of Filters and then calls a Handler. The Handler sends the request on to the target application or to another Chain for further processing.