ctrl-f and ctrl-b don't scroll an entire page

Hello!

When I press ctrl-f and ctrl-b I seem to get a full page (in my case, 28
lines) less 2, both forward (via ctrl-f) and backward (via ctrl-b). I'd
like to have my mpage plugin (which shows a buffer with multiple
contiguous pages) scroll forwards and backwards by a full page.

I don't see documentation about this (:he ctrl-f says it scrolls a full
page), nor did I see any way to modify what vim thought a full page
was. Now, I can do

noremap <c-f> <c-f>2<c-e>

(and similar for <c-b>) to get the effect I want -- but I'm wondering
about that "2". Is this "a page has rows lines less 2" standard, or is
it an artifact of my o/s? (I've tried it with both vim and gvim under
Scientific Linux, huge).

Regards,
Chip Campbell

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