For reference, the "contact configurations" are meaningless. it just means that the modem/network card/sound card whatever doesn't need that particular connection; most of them are various data and voltage lines. For example, if a card doesn't use 3.3v inputs, why would they need a contact for it, right?
In fact, Allan was only covering his but by saying "almost certainly". I cannot think of ANY other interface that would be used for modem, except for ISA, which was phased out over 10 years ago.
Basically, nowadays, if you buy a new computer, you have either PCI, PCI-Express, or more often then not a combination of both. the differences between them are not hard to spot- a PCI card simply doesn't fit in a PCI-E slot, being that teh slot itself is just over an inch wide for PCI Express x1 (and the connection for the video card has been ubiquitously unique for over 10 years as well; it's either AGP or PCI-E 16x, and if it's neither, then it's on-board.
EULA stuff regarding OEM (well... sort of):
http://blogs.zdnet.com/Bott/?p=1561BTW, it's perfectly legal to install windows using a "recovery disk" from another Computer. As long as that computer does not have windows installed. Basically, the same EULA license terms apply to the copies of windows that come pre-installed on machines as with those that you buy at retail. The reason people get confused is because the manufacturer's provide a branded recovery disk, instead of the actual windows CD. the customer is still a legal owner of a copy of windows,
but they don't have the actual installation mediaThere is no separate Retail and OEM license. There are differences between the way the two work, but this is simply because of the crap that the manufacturers do to jump through MS hoops- like, for example, tying the recovery CD to a specific BIOS. This does NOT change the rights of the owner as given out in the EULA, which includes the ability to transfer the windows license to another PC.