Problem with opening a new Window

I'm writing a programm with gwt in Eclipse. It is a calendar where you
can add dates. I also implemented a method to show an overview of all
dates. At the moment it is shown in a Dialogbox. Now I want that
overview to be printed. So I have to questions
1. Can I print a dialogbox? If yes HOW?

2. If not: can I open a new window, where the overview is included?
How can I do this? I saw the function Window.open (URL...) but how can
I say what the URL is? I don't know what is the name of it. How to
create a new Window? Can you give me a piece of code?

Many questions and hopefully many answers.

I hope you can help me

Thanks for now

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