Other applications are probably run by blindly running 'java' and hoping it works. LimeWire doesn't. We have our own executable that creates the VM and starts LimeWire. This is necessary for various reasons, including making sure that various firewalls report LimeWire as wanting access (instead of 'java'). Our executable has to look in the registry to find where the JRE is installed & then load up the necessary dlls. I suppose we could extend the executable to look also for the JDK (if it doesn't find a JRE), or look for the one with the higher version... but for the vast majority of people, the JRE is what we want.