Who's On My Wifi
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Who Is On My Wifi detects intruders
on your wireless network.
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Home Edition
for only $26.95.
Professional Edition
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WPA Encryption - not quite WEP, not quite WPA2.
WPA stands for Wi-Fi Protected Access. WPA (what you might call original WPA before WPA2), was in use for a limited time because it could be used on Wireless Routers that didn't support the full 802.11i standard.
The only reason to use WPA on your wireless network would be if you have older laptops cards that don't support WPA2.