This week's book giveaway is in the Cloud/Virtualization forum. We're giving away four copies of Cloud Application Architecture Patterns: Designing, Building, and Modernizing for the Cloud and have Kyle Brown, Bobby Woolf and Joseph Yodor on-line! See this thread 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.