In XP you can add a secure iPrint printer without the iPrint client in
'add a printer' like this -

https://[server ipaddress]/ipps/[printer name]

XP would bring up a authentication box for your eDir credentials and
provided you install the right driver all works fine.

How do you achieve this in Vista? I have had no luck getting secure ipp
printers to work natively. The print system does not seem to work in the
same way.