>
> I can add this patch to my build sessions.
>
> I'm confused about applying. Which apps are a good test environment?

All applications are good for testing!

> In Firefox I use Ctrl-Page Up and Ctrl-Page Down to move through tabs.
 > Likewise in Konsole and Konqueror. In Kate I use Alt-Left Arrow and 
Alt-Right Arrow.
 > Yet all of those are self-contained or MDI apps.

Yes they are self contained but they do not manage windows. This use 
case gets really important across multiple screens. Firefox can be all 
in one window, more often than not it is more. Same goes for kate and 
konsole. I often keep a Konsole open for building, another for all my 
ssh sessions and so on.
>
> If I am using KWrite, which is SDI, and one of the KWrite windows has the focus,
> the Alt-` shortcut allows me to cycle through only the KWrite windows?

Yes. Well actually, Initially hit Alt+`, this will let you do the quick 
switch between two. Once the tab box comes up, you then need to continue 
to hold down alt, and use tab to rotate.
>
> If I understand correctly, then I if I have a dozen windows open,
>I use Alt-Tab to focus on the app and then switch to Alt-` to cycle until I find the specific KWrite window I want?

Yes, but you would actually need to let go of the alt button. It's a one 
way street. You start with Alt+Tab, you're going to be cycling through 
all the windows. if you start with Alt+` you'll be cycling through just 
the windows of one type.

The best way to understand it is by trying it out :-)

Calvin