JRE and Microsoft VM

I would like to develop applets which can run on both the Microsoft Virtual Machine and the Sun JRE 1.4.1
Could anyone tell where I can read how to do this? - which specs to use?
Do I have to compile with an old SDK version?
- or just not use any new classes or methods? - since which SDK?

You can't use any new classes or methods, and for compilation, you can use latest JDK with "-target 1.1" parameter:
javac -target 1.1 YourCode.java

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