How to create a popup???

Is it possible to define a dynpro as a popupwindow?

What i want do is: I have a list and by clicking on a entry of that list i want to show some detailed information in several fields of a popup window.

first Question:

How do I have to create that popup window?

second Question:

What would be the best way to leave the popup window and just showing the list again without having to rewrite the list? (During showing the popup i want to see the list in the background)