How to create documentation?

I have seen several java/j2ee programs which have their documentation and it looks exactly like the documentation that this sun website has!
How do we create such documentation..?
example: Websphere gives sample code to run to test the server.. They also give Javadoc which is specific to that application and yet it looks like suns documentaion??
Can someone explain this?

EXAMPLE...It has on top ..
Overview Package Class Tree Serialized Deprecated Index Help
PREV NEXT FRAMES NO FRAMES
etc...

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