To disable password caching on an NT workstation you need to add a line to the registry.
First, create a ASCII text file called DISABLE.REG with the following lines:

After installing your wireless WiFi access point in your home or office you might experience some performance issues or even connectivity failure. Most access points are shipped defaulted to a similar channel. Radio interference from a neighboring router/access point or some other electronic equipment like a cordless phone could be the culprit. Changing the Wi-Fi channel from the beginning might just be the best way to avoid these type of problems.

Wireless devices will generally be shipped with a default SSID (service set identifier) that will be identical on the same product shipped to others from this products manufacturer. In order to secure your wireless network making it more difficult for others to connect, its a good idea to change the SSID to something different and also turn off the "broadcast SSID" feature if possible. You can also configure the device to only allow connections from certain MAC (factory burned in addresses for the Network Interface Card) addresses which belong to your devices and will be unique if the device supports this capability.