Quickly retrieve available Java JVM on a workstation (Windows)

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment]
"CurrentVersion"="1.5"

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.4]
"JavaHome"="C:\\Program Files\\Java\\j2re1.4.1_02"
"RuntimeLib"="C:\\Program Files\\Java\\j2re1.4.1_02\\bin\\client\\jvm.dll"
"MicroVersion"="1"

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.4.1_02]
"JavaHome"="C:\\Program Files\\Java\\j2re1.4.1_02"
"MicroVersion"="1"
"RuntimeLib"="C:\\Program Files\\Java\\j2re1.4.1_02\\bin\\client\\jvm.dll"

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.5]
"JavaHome"="C:\\Program Files\\Java\\jre1.5.0"
"RuntimeLib"="C:\\Program Files\\Java\\jre1.5.0\\bin\\client\\jvm.dll"
"MicroVersion"="0"

[HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.5.0]
"JavaHome"="C:\\Program Files\\Java\\jre1.5.0"
"MicroVersion"="0"
"RuntimeLib"="C:\\Program Files\\Java\\jre1.5.0\\bin\\client\\jvm.dll"

@echo off
::Find the current (most recent) Java version
start /w regedit /e reg1.txt "HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment"
type reg1.txt | find "CurrentVersion" > reg2.txt
if errorlevel 1 goto ERROR
for /f "tokens=2 delims==" %%x in (reg2.txt) do set JavaTemp=%%~x
if errorlevel 1 goto ERROR
echo Java Version = %JavaTemp%
del reg1.txt
del reg2.txt

::Get the home directory of the most recent Java
start /w regedit /e reg1.txt "HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\%JavaTemp%"
type reg1.txt | find "JavaHome" > reg2.txt
if errorlevel 1 goto ERROR
for /f "tokens=2 delims==" %%x in (reg2.txt) do set JavaTemp=%%~x
if errorlevel 1 goto ERROR
echo Java home path (per registry) = %JavaTemp%
del reg1.txt
del reg2.txt

pause