Defined in tcl/address-book-defs.tclassumes scope is set in the callers environment. if scope=group it assumes group_id is set in the callers environment, if scope=user it assumes that user_id is set in callers environment. For scope=group, returns the name of the group if the user is authorized. For scope=user, returns the person's name. For scope=public, returns the site name. For scope=table it returns an empty string.