No. As we use the CSCS chats for classroom simulation, we would prefer it if we could identify all the users and also if you could give undivided attention to the chat in progress. Once you are enrolled in a course, we will open new yahoo Ids for you and send you the user ids and the passwords by mail. Your Yahoo chat id and your CSCS user ids will generally be the same. We also need to archive the scheduled chats and evaluate the participation of different students and hence the ids we provide must be used for all official chats unless otherwise specified.