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The router has 4 ports + wireless. So can wire up to 4 items on the router, as well as use wireless. The wireless can theoretically add loads more devices limited only by the router's DHCP ability (IP address issuing).
This is what you need to connect your PS2 wirelessly:
http://www.netgear.co.uk/home_wirele...et_bridges.php
Wired is just a case of getting an ethernet cable between a spare port on the router and the network connection socket on the PS2