Currently Being ModeratedDec 5, 2012 8:04 AM (in response to tim bradbury)
Each user has a unique Apple ID.
Currently Being ModeratedDec 5, 2012 8:23 AM (in response to tim bradbury)
Anyone can access any iCloud account if they know the login and the password. Assuming that you and the others concerned already have iCloud accounts with separate logins you could create a new Apple ID, use it to create a new iCloud account and then everyone would log into it in System Preferences>Mail, Contacts and Calendars so that its contents would appear alongside the individual 'Primary' accounts. If they don't have their own iCloud accounts they can sign in in System Preferences>iCloud, of course.
You can enable the particular types of data syncing you want to carry out, but be aware that iCloud isn't designed for multi-person use, and basically everyone has full access to the account as if it was their own.