This week's book giveaways are in the Refactoring and Agile forums. We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line! See this thread and this one for details.
Do you mean the ServletConfig class ? If so, look at ServletConfig. A servlet can access a ServletConfig, and retrieve thinkgs like initialization values. You can see the full thing a servlet can access via its ServletConfig, by looking at the API above.