How is windows registry affected on installing JDK

I have a basic query ,when u install JDK ,JRE also
gets installed
does it make an entry in the registry(windows
system).Also the browsers supporting java do they come
with their own JRE's ie. a system can have 2 JRE's at
the same time or is it that the browsers use the JRE
of the JDK.
I got an unsual error once after lots of successful
executions saying that the dll for jre1.3 was not
available and incompatible with jre 1.2
..dont remember the exact error.
When i installed the jre1.3 , the same error did not
come.
So I am pretty confused , why did the jdk1.3
installation not install the jre1.3 .....Can any one
helpYes, installing the JDK does put registry entries in. Search your registry for java. It'll list all your JDKs and also which is the current one. You can switch the current one between your JDKs. Also, running java on windows often results ( in certain versions, I know it does on win2000 ) in putting java.exe in the winnt directory, so even though your path variable may point to the correct jdk, if the wrong java.exe is in your winnt directory that will get picked up, with pretty unpredictable results.

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How is windows registry affected on installing JDK

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