Can I use home sharing if the other computer is off?
I have a Mac Book Pro and my husband has Dell Desk Top PC...can he use home sharing to hear my music if my Mac is not on?
Also can he permanently put my library on his computer using home sharing?
No your computer has to be on to listen to the music.
If your husband wants to listen to the music on your machine without it being on he would have to use the HomeSharing to import them to his machine