Thats what I love about the Netlink. The DC's modem is useless for multiplayer now(does it system link?), but the Saturn's still as useful as it ever was(still useless to the average gamer).
Someone told me that it does system link if you just tell both systems to dial zero, or something like that. I forgot the details. I should try this since I have two Saturns and Two Netlinks, but I don't think I have two copies of the same NetLink compatible game. Futhermore one of my Netlinks is the grey Japanese one with the card slot, and the other is the US one so its likely that even if I a copied a Netlink game I have it might not recognize the modem. I'm not sure how much different the modems are, but the case is totally different, the JP ones has a slot for Xband cards, and I'm pretty sure the US one is 28.8 and the JP one is 14.4.
Now that I think of it I'm pretty sure my girlfriend has a complete selection of US Netlink stuff.
Then there is the trouble of getting the Saturn POS cart slot to actually work...