I have an iMac and my wife and I both have separate logins. I would like to set up an iphoto library that is shared between both users. Specifically, I have an external firewire drive that I use for backup and thought of potentially moving the library to this drive so it could be shared. A few questions: 1. Can the library be shared between users on an external drive? 2. Do I have to create a separate partition on the external drive - it is used fo time machine currently. 3. Would photostream still work in iPhoto if we share a library - my wife and I currently have separate iCloud accounts. Thanks.