This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
It's a concept that indicates your application/servlet will behave appropriately if two threads are executing i.e accesing variables and/or methods at the same time. I am assuming you understand what threads are.
Bosun (SCJP, SCWCD)
So much trouble in the world -- Bob Marley