|Users, Groups, and Permissions / Working with Permissions|
Because the Everyone Everywhere group includes every user on the system, this group establishes the default permissions for all your Vocera users. For example, suppose you want to grant every user across all sites certain basic permissions, such as Call Internal Numbers and Call Toll-Free Numbers. You can specify these permissions in the Everyone Everywhere group, then grant additional permissions by providing membership in additional groups.
Similarly, an Everyone group establishes a set of default permissions for the specific site it is associated with. For example, suppose you want to grant all sites the Call Internal Numbers and Call Toll-Free Numbers permissions, but grant only the North Beach site the Call Toll Numbers permission. Grant Everyone Everywhere the Call Internal Numbers and Call Toll-Free Numbers permissions, then grant the North Beach Everyone group the Call Toll Numbers permission.
If your Vocera deployment does not implement multiple sites, you can ignore the Everyone Everywhere group and set default permissions in the Global Everyone group.