Scanning my Express Wireless Network

Hi there,
I have a cable connection to the internet, connected to my Express to create a wireless network at home for my Powerbook.
My question is, can I 'look' at the network to see if there are any other computers using it? Basically piggybacking on my network for their access?
Reason I ask is that sometimes the Internet connection slows up dramatically for a while and then goes back to normal - no other 'drains' on bandwidth are open so perhaps someone else is using it?
Some sort of admin tool, I suppose is what I am looking for...
Also, I have set the network up with a passsword, but I am wondering if there is a more secure way to 'lock-up' my home network...?
All help and guidance is greatly appreciated!
Thanks

Which type of wireless security are you using for your wireless network?
WPA2 is more secure that WEP but using WEP is better than not encrypting your wireless network.
Not sure about determining if someone else is piggybacking on your wireless network but to be sure, change your wireless network password and enable WPA2 for security.
You can also create a "closed" network which doesn't gain much for security but the name of your wireless network will not show up as an available network to choose from on someone else's computer within range.

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