When you're on Hamachi, and have to go, make sure you right click the network (outpostuniverse.net) and click Leave Network before you go. Just clicking Power Off still leaves you in the network, taking up valuable space. (We only have room for 20.) Currently, there are 16 users on our ham network and only 5 of them are actually active/connected.
In short:
Don't just click Power Off, make sure you actually leave the network first!!!