Different JRE Version requirements

I apologize in advance if this has been posted and answered already; I couldn't find the right combination of keywords to locate it...
The company I work for has two large partners that it works closely with. One of these partners Java programs require JRE 1.4.2 the other company's programs require at least JRE 1.5. To this point we have not been able to find any way to direct company A's java programs to use JRE 1.4.2 and company B's programs to use JRE 1.5 on the same computer. This has required that certain people be setup for company A and other people be setup for company B. Is it possible to force these programs to use the version of Java they're looking for on the same computer?
In one case these programs are a mix of Java applets and JNLPs, while in the other they are all Java applets.
TIA!

Try it and see, I've ran earlier version bytecode on new releases and also compiled old source on new JDK's without any problems before, but then your app is not my app and you may have used something or combinations of somethings that nobody else ever has and it yacks on you.
Never know until you try it.
BTW: I'm still running some of my 1.5, 1.4, 1.3, and 1.2 code on 1.6 no problems, but then not all of it is rocket science either.

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~

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