Doesn't F10 do the same thing?
I think what that poster means is that when you alt-tab in Windows, it lists different documents in most apps (e.g. Office apps) as separate "tasks." So if you have Finder and Word open with six word documents, when you Alt-Tab, you only see two options. When you do it in Windows, you see the six word docs separately.
Not saying I want that!
Exposé does the equivalent, in essence; with the alt-tab type method, you have to use alt-tab and alt-` on Macs....
I think that's what he (?) is getting at, anyway.