At home I use a Mac PowerBook G4. The only time I'm interrupted by a window I'm not in is when the other window needs attention. ('Excuse me, iTunes needs your attention.') At work I use a Dell laptop running Win2K. I frequently have several windows open (Extra for the mainframe, Outlook, a database search application, one to three Internet browsers, a database folder, Excel, Word, maybe a mail or two). Typically I'll go somplace on the Internet, and then go to one of the other windows -- Extra, for example. But Extra won't come up while the browser is loading. Or Extra or Outlook or whatever will come up and I'll start typing, only for the browser window to pop up and prevent me from doing what I want to do until I click back to the other window.
Is this annoying 'feature' a Windows thing? Or is it just that I have fewer windows open (typically two browsers and Mail) on my Mac, and my Mac is much faster than my work PC?