From what I understand, iTunes can be Home Shared up to 5 machines. After setting up my iTunes on 3 machines, I am told I have used 3 out of 5. Of course. If I Deauthorize 2 of them, does that mean I have 4 authorizations left? Thing is, 2 of my machines are temporary installations. So I was wondering if I should "save" my remaining authorizations. Should I dread the day that I will run out of authorizations? Thing is Home Sharing is a convenient way of moving your iTunes library across different platforms.