How to interpret IRQ sharing chart?

I mean, at my KT266PRO2 manual, although I want to know how it should be interpreted in general, not specifically for my board.
The chart has for example 7 rows and 4 columns, the rows are the PCI and AGP slots, now my problem is with the columns, they have letters from say A to G, first column should be easy to interpret but what are the following columns intended to represent?
Thanks Gustavo.-

ex with my kt3 ultra 2.
if i have the promise ata controleur, it takes one IRQ and can't be changed.
letter D (ie irq D)
the video ags take another IRQ (the first available) called A.
pci slot 1 takes irq A (share with video then)
pci slot 2 takes irq B (shared with pci5)
pci slot 3 takes irq C (not shared)
pci slot 4 takes irt D (shared with promise ATA)
pci slot 5 takes irq B (shared with pci 2).
the promise ata set its irq before all ather and is in the first column.
If you don't have a promise ATA, read column 2, The AGP card takes its irq first and now pci 4 doesn't share its IRQ.
pci 2 and 5 are physicaly assign to the same IRQ in all case...
the letter is for an IRQ, depending on device desactivated on the mobo (ps2 mouse for exemple).
USB, onboard sound card, onborad ethernet contrôleur use irqs too and are not listed here.

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