Hi Phillip:
I am not sure I understand your question?
Word 2008 (any application, actually...) offers "Save as PDF". This
function is actually provided by the Apple OS X Finder. The dialog you see
when you do anything to files in Microsoft Office Mac is actually a window
from the Apple OS X Finder.
The "Save as PDF" function calls out to the Apple PostScript Driver (which
is actually supplied by Adobe). When you check "Save as PDF", the Finder
sends a job to the printer with a bit set that tells it "Don't send this one
down the wire to the printer, give it back to the Finder, so I can save it."
So actually, it doesn't call anything BUT Apple (and Apple-made-by-Adobe)
routines.
This is different in Windows: Adobe wouldn't give Microsoft the licence to
save as PDF, so the Windows PostScrpt.drv driver was never apple to save
PDF. It can and will save "PostScript", but it is not allowed to turn it
into PDF.
So Microsoft wrote a separate utility that is available as an add-in to
Microsoft Office. This utility will produce PDF, and it will also produce
XPS, Microsoft's Open XML competitor to PDF. XPS has a number of advanced
features that PDF does not currently support. Since Microsoft uses the same
utility to write both PDF and XPS, and since XPS is a "HTML-like" language
that runs on hyperlinks, hyperlinks magically found their way into Microsoft
Office 2007's PDF as well. Quite by accident, of course! Which sorta
removes one of the compelling reasons for shelling out 500 clams for Adobe
Acrobat!
XPS is a seriously good idea, so as soon as Adobe saw that happening, they
instantly allowed Microsoft to ship PDF at a reasonable price.
Nothing like a little creative bullying to make one's competitors see sense.
Adobe knows damned well that if XPS ever takes off, it will lose one of its
most important cash cows
Hope this helps