Might be a silly question but here goes.
writing this from memory as I am at work.

I have successfully done this finiding out my router encription password.
obvously I have changed this and relised that wep is not strong.
How ever I have noticed my neighbours use stronger ones like wpa etc.. but thing is I am only one that has beacon showing others havent.
I am assuming that they my neighbours are not using wireless ultility?

Hope this makes sensce as my english not good.