An amazing tool to run applets and applications written in Java programming language, the Java Runtime Environment (JRE) 6 provides libraries for Java Virtual Machine. The Java Runtime Environment (JRE) 6 has two key deployment technologies which allows applets to run in most accessible browsers and the Java Web Start, which position standalone applications over a network. It is interesting to see that users using Windows can also run Java applications with out any installation of JDK. It may also be seen that it is a run time part of the Java dev Kit i.e. with no compiler, debugger or any peripheral tools included. Java Runtime Environment (JRE) 6 is the latest release of the Java (SE) platform with total support from NetBeans IDE 5.5 software. The major advantages are New Security Features and Enhancements, Integrated Web Services, Scripting Language Support (JSR 223), improved User Experience. This software assures users the best user experience in the field.