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.
I am guessing that Arun wants to run two different versions of Java (e.g. Java 1.4.2 and Java 5). This would be done by setting the PATH variable suitably, or by hard-coding the path to the java.exe file.