hmm I take it that only your labtop uses a wireless connection while the desktop is wired to your modem?
.. I do not think that it matters either way.
What you may want to check is your sharing setup (system preferences) (services/firewall/internet). If you do not use remote login on your labtop you can disable this (as ftp access etc).

Markus


Partial glossectomy (25%) anterior tongue. 4/6/07/. IMRT start @5/24/07 (3x) Erbitux start/end@ 5/24/07. IMRT wider field (30x) start 6/5/07. Weekly cisplatin (2x30mg/m2), then weekly carbo- (5x180mg/m2). End of Tx 19 July 07.