[Conkeror] How can I control pdf file viewing?

[Silvio Levy]

Hi, I've poked around a bit but haven't found the answer: 

Currently, when I click a pdf link, I get an instance of acroread in
the same tab as the parent page.  I'd like to change this in two ways:

(1) xpdf should be used instead of acroread
(2) a separate window should appear, preferably an xpdf window but a 
  conkeror window would also be ok.

If either of these is not possible, I'd like to have conkeror save
instead of open each pdf file (with or without asking first). 

Note that I have download_buffer_automatic_open_target=OPEN_NEW_BUFFER
because I want download windows (for movies and other long downloads)
not to clutter the screen, but I need to view pdfs on a separate
window from the browser.

Thanks,

Silvio