Marks all the documents in a collection unread.
C all notesDocumentCollection .MarkAllUnread( [username] )
username
String. Optional. If present, the method marks all documents in the collection as unread on behalf of the given name. If omitted, the method marks all documents in the collection as unread on behalf of the current user.
If the database does not track unread marks, all documents are considered read, and this method has no effect.