1394 Connection?

My 8300 os connected to a LAN with 2 other PC's operating on difference platforms; an old desktop running WIN95, a portable running WIN98SE, and this dell running WINDOXS XP HE. When I look at the properties of the XP I find 2 rather than 1 items for connections; a LAN enabled Intel PRO/100 VE and a "1394 Connection". Although the later says it's "enabled", it's properties show no traffic.

I became curious about this 7 months ago when I bought the machine but somone told me it was only my network card anmd not to worry about it. Recently, however, I've had trouble accessing the Dell from the other machine (something that's rarely done) and I've been trying to understand why I can "see" the other two machines fromt the DELL and the other two machines can see each other when the DELL is off but those older two machines can't see the DELL when it's on... though the DELL can see and activate both of them.

When I looked under the properties of the 1394 that never shows traffic, I noticed a grayed in box under the Advanced tab. The box is "Allow other network users to control or disable the shared Internet connection. Unchected is "Allow other network users to connect through this computer's Internet connect. Should this be checked?

Any idea why I have these two connections listed and if one isn't needed, how I get rid of it? (If I should)