If you use your Mac as a Wi-Fi hotspot, OSX Mountain Lion removed the ability to use WEP security protocol, and forced you to either use None or WPA2 security protocol. This is bad for older devices that do not support WPA2, but only support WEP. If you don't want to risk using None as security protocol when connecting these devices, you can use the SECRET option key combo to turn on WEP 40-bit and 128-bit security in the menu selection.
Here is the video showing where:
http://www.youtube.com/watch?v=nAV5hkNT7FA
Here is the video showing where:
http://www.youtube.com/watch?v=nAV5hkNT7FA