asp.net comet server expert

I want to have a website where users create an account and the site can monitor if they are online, and then users can initiate a chat with one another. This site will have no popups, and will use comet technology to have the chat working similar to gtalk. 1) It needs to be scalable to handle at least 10 concurrent chat sessions. 2) We also will need an admin area where all the chat rooms can be monitored. 3) Admin should be able to join conversation for three way chat 4) we need to log all conversations, login times and logout times There are a large number of features, that can be discussed in more detail later. ## Deliverables will require pages: 1) chat page 2) buddy list with user's online statuses 3) admin page to monitor current chatrooms 4) admin page to view transcripts 5) admin page to view all online users 6) register page for new users