Multiple versions of Java simulaniously?

Hi,
We have a situation where the new library system we use will need Java 6 Update 3 specifically. We also use a web-based application that can't use 6 V.3 but something lower like 5. My question is, would having both versions on a PC be ok?
Thanks,

If your environment is Windows things are much easier. Every time you install the latest java runtime environment: it is set (by default) as the system's default runtime environment(So there is no problem with the previous versions). Regarding to the Java Development Kit(JDK): i thing your self as non a java developer, so i presume that you don't have any installed to your system.
So in my opinion there will be no problem if you erase the older java runtime environments.

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