Understanding the IRQ assignments table for my new ASUS A7V880 MB...

I've been building my own systems for about five years now but one thing has
always
left me guessing as to exactly what information is being conveyed by the
tables that appear
in every MB manual I've seen regarding the expansion slots and which ones
share IRQs.
Here is the table from the MB manual and it seems to do nothing but confuse
me so I am
here hoping someone can explain exactly what this information means:

INT A INT B INT C
INT D
----------------------------------------------------------------------------
------
PCI slot 1 --- --- ---
used
PCI slot 2
red --- --- ---
PCI slot 3 ---
sed --- ---
PCI slot 4 --- ---
hared ---
PCI slot 5
red --- --- ---
Gigabit LAN --- ---
hared ---
AGP slot (8x)
--- --- ---

OK here's the thing, every other time I've seen these tables they have had
all
the columns filled in. So my questions a How does INT A, INT B, INT C,
and INT D relate to the IRQ asigned to a device in a particular slot. And
what
do they mean by "used" (I hope this does not mean I can't install a card
into
PCI slots 1 and 3). And finally, how do I determine which of these are
*really*
"shared" slots (I sure hope the AGP isn't shared with slots 2 and 5). And
one

final question: How do I determine if a certain device driver supports IRQ
sharing?

I want to configure this system with Windows-XP PRO and the following
add-on cards:

(1) ASUS V9180 Magic GeForce MX 440 8X AGP (for primary display)
(2) Visiontek GeForce4 MX420 PCI (for second display)
(3) ATI TV Wonder Value Edition PCI (TV-Tuner and Video Capture)
(4) 3Com/US Robotics 56Kbps VOICE/FAX modem PCI (FAX & digital answering
machine)

(5) ADI AD1888 SoundMAX 6-channel audio with S/PDIF-out interface (onboard)
(6) Marvell 88E8001 Gigabit LAN adapter (onboard)

-----
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- G.L. Cross