External monitors as "desktops"

Is there a way in kwin/plasma to make an external monitor its own "desktop?" 
That is, when you hit "ctrl-tab" to change desktops, that monitor does not 
change its display?  Similar to the way Mac (can) handles external displays.

Thanks!

j

-- 
Joshua J. Kugler -- Fairbanks, AK
Blogs: http://jjncj.com/blog/ (Family) -- http://joshuakugler.com (Geek)
Philippians 2:9-11