Imre Major's questions

Typical situation is that I type something (worst case is my password) in some application, when some other application pops up a window and steals the focus, so my typing (password) goes to something else. I would like to prevent this, at least when I actively type something in an edit box. I always really hated this on Windows, but I never found a way to prevent this. I started using Ubuntu a while ago, and so far I was able to do everything I wanted, so I thought maybe this is also possible. Thanks in advance!