for the first time, i have 2 macs, and i'm trying to do some file sharing between them. on the host mac, i go into sharing prefs, enabled sharing on just the Public folder, added my username from the guest computer and set read/write privileges. when i log in from the guest computer (w/ username and password) and try to write a file to the shared folder, i get an error that i don't have sufficient privileges. i've repaired permissions, that didn't work. anything else i need to check?