You can turn it off, by going to its setup page. But you can't ask for it to tell you the network key, otherwise it would be pointless setting it for security in the first place, as anyone could ask for it.
I am wondering why you would want to turn it off..so you have to ask for it every time.
I thought the idea of the Network Key is that your Network knows it is your comps that are connecting automatically..no-one else will be able to connect to your Network...they would have to type this key in to get in.
Is there a specific reason for you needing to do this. Surely it will cause you a lot of bother.?