I'm sure some of you have done this... I've ordered my kids PCs for Xmas and want to link them to mine via a Netgear dg834g wireless router and USB adaptors. Question is, do I also need an adaptor for my 'main pc', or can the router be physically connected to i t (given it will sit a foot away, seems a pity to blow anothe 50 quid on the adapter if not needed)?