Define the difference between an open network and a closed network?

There are two kinds of 'household networks', Open and Closed. Open networks can be joined by anyone at anytime. Closed networks require permission to join. When you attempt to join a closed network, a notice is sent to the Closed Network's administrator requesting that you be allowed to join. That person will respond either accepting or denying your request. (remember, once you've joined a network, you cannot leave that network for 30 days - security reasons).