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Is this an OS thing. It wants to show something so it moves whatever is in the way out of the way.

Right.
How does hidden mode differ from minimized to an icon in the taskbar?

Was your previous code in Java? I don't recognize the class

How do you start IE in hidden mode?

Sorry, only do Java here.

What are the IE arguments for hidden?

Sounds like a lot of parts and interrelations that would be hard to duplicate for testing.

What do you mean by "when the applet starts"?
Where is the browser that runs the applet? Is it open and executing?

Can you make a small simple program that compile, executes and will show the problem?
Then describe the steps to take to make it show the problem.

Is any of this code that you are writing?
It sounds like you are complaining about the way some other programs work.

Not sure I understand what you are doing. Applets run in a browser. Does the browser's window change?
Does your applet create another frame?

Can you make and post here a small simple example that...