Wifi networks on WAP321

I own a Cisco WAP321 wireless access point, and it’s a pretty neat device because it allows you to create multiple different (separated) Wi-Fi networks. For home use, that option is not really very interesting. Well unless you want guests in your house to use a different Wi-Fi network so that they won’t stumble upon your file server and find your huge collection of ‘out of the ordinary’ weird, cheap, …