JVM Version question

Sorry for what might seem a really random question!
At work, we're using a software audit tool which lets us know all the .exes and .coms, etc which are installed on the PC's in our estate...
We need to know what version of JVM is installed on these PC's - does anyone know whether you can determine this by looking at the files on a machine? For example, is there an .exe (maybe of a particular filesize) that would point to the fact that a particular JVM is installed???
Does this make sense?

I assume you work on Windows.
If you want to know which VM is installed by suns means you can look in the Registry in
HKLM\SOFTWARE\JavaSoft\Java Development Kit or HKLM\SOFTWARE\JavaSoft\Java Runtime Environment
see http://java.sun.com/j2se/1.4.2/runtime_win32.html
Or if you want to search for a recource description look at the jvm.dll in %JRE_HOME%\bin\client\jvm.dll (client vm) %JRE_HOME%\bin\server\jvm.dll (server vm) . The fileversion should match the version of the jvm (java -version).
Note that in an JDK installation the JRE_HOME is in %JAVA_HOME%\jre where JAVA_HOME is the directory where the jvm is installed.
The safest way would be to tell your tool to search for jvm.dll and the fileversion entry. For j2sdk 1.4.2_05 it is 1.4.2.50
This is true for 1.4.2 my installations.
I found that in all installations the rt.jar in the lib dir of the JRE contains in his Manifestfile the implementation-version of the installed JVM. This means look at the META-INF dir in the rt.jar (Zip-File)
and open the MANIFEST.MF and look at the tag Implementation-Version. (e.g. Implementation-Version: 1.4.2_05)
I have not found more to identify the vm. The safest is to call java -version.

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