>  Is there a way to scroll the upper window without put the
>  cursor into it?

Depends on whether you want to scroll the non-upper-window too. 
If you want to scroll them in pairs, you can use the 'scrollbind' 
setting in both windows.

   :help 'scrollbind'

If you don't want to scroll them in tandem, you'd have to map 
something like

   :nnoremap <f4> <c-w>p<c-e><c-w>p
   :nnoremap <f5> <c-w>p<c-y><c-w>p

to scroll down/up by one line in the previously-visited window. 
You can adjust the mappings to use the scrolling-motion you want 
if <c-e>/<c-y> are too fine-grained for you.  (such as using 
<c-u>/<c-d> or <c-f>/<c-b> instead).

Lastly, if you use the mouse (a heresy in some vim crowds, but I 
know Tony is a mousing vimmer with long-standing credibility, and 
I'm ambivalent about mousing-dogma), you can use the scrollbar in 
non-focused windows to scroll without changing focus.

>  (by the way: while I was searching the help for a solution
>  to this I came accross CTRL-W z, which closes a "preview" window.
>  What is a preview window and what is the difference in previewing
>  an ascii file compared to viewing an ascii file?)

The preview window

   :help preview-window

is just another text buffer, but with some special attributes 
(uniqueness-per-tab, usually small with a defined 'previewheight' 
height.  The window is usually used to see the definition of a 
function or some other temporary bit of information that you plan 
to dismiss or overwrite.  I can't say I've used the preview 
window more than a handful of times, but some plugins make 
extensive use of it.

-tim





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