Try to avoid popups. It's a question of style. Furthermore, there are popupblocker what may block your window. I hate popups. Is there really a reason not to show your result in the window you have?
Actions aren't performed "in" pages, they're performed "on" backing beans. Whether the page that's navigated to is in the same window or another one is a different matter. However, in my browser configuration, popup pages are either suppressed or open in invisible tabs, so design accordingly.
Post by:autobot
What do you have in that there bucket? It wouldn't be a tiny ad by any chance ...
a bit of art, as a gift, the permaculture playing cards