There are many ways to do this. The security controls are usually found 
in your router. Check the manual for instructions, or check with your 
ISP if they supplied the router.
XP Help has some info on this, or you can look at:
http://www.practicallynetworked.com/support/wireless_secure.htm


Jacqueline MacWhirter wrote:
> How to stop someone from using your  internet resource how can you block 
> them --I was asked this tonight  for an example suppose someone had a 
> wireless laptop and tapped into your internet resources - you have high 
> speed cable how could you block them ? Thank you Jacqueline MacWhirter
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