If you someday have a window out of your screen or at least the title bar out of your screen as I had today, I was surfing the web using Opera and when I pressed CTRL+F to look for a text in the page the little window appeared too high in the screen that I could not click on the title bar and move it a little down.

Well the solution for this is to press the and hold the ALT key, and click any place on the window to move it.

Tip: If you use the righ button of the mose you can resize it without need to click on the border of the window.

Hope this may help you.