2 apt-get questions

[Hal Vaughan <hal@thresholddigital.com>]

I know this should be very simple and easy to find, but I'm having trouble 
answering these two questions.  I've been through the apt-get man page a few 
times.  Since I'm trying to do something on a "one-time-only" basis, this 
shouldn't be a config problem -- I'd expect it to be available as a command 
line switch.

1) How can I specify the source site to use to retreive a specific package?  
(In this case, I added download.kde.org with all the info to point to the KDE 
3.1 packages, but apt doesn't seem to see anything above KDE 2.2, even after 
apt-get update).

2) How can I install a .deb file that I've downloaded with my browser?  (I 
downloaded a game that was a .deb file into my home directory.  I searched 
the /var dir tree and found .deb files in /var/cache/apt/archives, so I 
copied the file in there, but "apt-cache search" doesn't show any awareness 
of the downloaded package.)

And, if the answer or info I'm looking for isn't in the apt-get man page, 
where would it be?

Thanks!

Hal