This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
1. Class-Path entry to specify dependency on an external jar. For example, your ejb1-jar.jar depends upon a helper.jar
2. If you are using an application client then you specify the Main-class for the application client jar. Most application server's Application Client Container launch the application client based on the Main-Class attribute