Member Rara Avis
If the motherboard supports more than four slots, it almost certainly is using a Bridge to do so. Unfortunately, it's even more complicated than that. Some new motherboards are supporting the 66mHz PCI bus, rather than the original 33mHz, and that cuts the specs in half. So, if a motherboard includes more than two slots, it "might" be using a Bridge.
Just by looking at the motherboard, I know of no way to tell which slots are which.
Used to be, it didn't really matter. Those running off the Bridge would be no different than those directly attached to the motherboard. If you're running a new operating system, however, like Windows 2000, it just might matter.
When you turn on Windows 2000, the OS asks each adapter for some very important information. It assumes that information won't change until the machine is physically powered down and back up. Some of the Bridges, unfortunately, don't adhere to this assumption. The reason I bolded the word "physically" is because the new "sleep" mode is a non-physical powering off of the computer. And some Bridges will awaken from sleep mode with NEW information, which Windows 2000 will never see. Ergo, the adapter stops working properly and it can even freeze Win2000 in the process. The solution is to either disable sleep mode or, better, put the adapter in a non-Bridge PCI slot. As far as I know, the latter solution is a matter of trail and error.
Your new signature is at least better than the last.