why so many on irq 9?

I have five items listed under irq 9, system ok but why so many?
fyi these are whats under irq 9
Microsoft ACPI-Compliant System
Intel 82371AB/EB PCI to USB Universal Host Controller
YAMAHA NAtive DS1 WDM Driver
3Com EtherLink XL PCI TPO NIC (3C900B-TPO)

Just wondering why win2k would assign so mahy things to one irq.
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More about tomshardware
  1. That's ASPI. Your suppose to be able to have shared IRQ's. Does your sys run fine? If so don't worry . . . Ge Happy!

    <b><A HREF="http://www.seti.tomshardware.com/" target="_new">How fast is your PC</A></b>
  2. That's a 'feature' (read: unwholey-practice) of Win2k. Turning it off solved just about every problem I had. I think someone proposed incorporating the same thing into Linux, but the poor guy went into hiding due to a death-edict.
  3. Heh, speaking of irq9, that inspired the title of my website <A HREF="http://irqnine.3comsbc.com" target="_new">http://irqnine.3comsbc.com</A>. Pay a visit... although it's just a few articles I wrote about, take it as a graphical critique. Thank you.

    This site is cool.
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