Java Reflection possibilities

I'm starting to study reflection lib and what I can do with it. I got few questions and can't find answers in javadoc and forums or maybe I can't see it "D.

• Questions are:
• Is there any easy way to prevent my program from this or its "fighting with windmills"?
• Can Java reflection mirror get classes and methods from other program, that is not in java or not loaded in JVM? or it is assembly based and can reflect anything?
• Does my invoke in other program's work flow shuts down main thread of that program and redirects to my created new thread or it something else? (Work flow explain please).

If you know good e books about reflectios api things, drop them here :) Appreciate