Thank you for helping me and here I got another one. I want to develop a Login Server program and I found there are two approach to process the requests from the clients.One is processing requests one by one and the other is processing several ones simultaneously in different Thread.There are also two way to choose,who can help me?(the profiles about players is in SQL2000).If there is another better method,share it with me,OK?

It depends on how many people you think you''re going to have logging on each second. If you have a lot, you probably want to go with the multi-threaded approach. However, if the demand on the server isn''t going to be that high, you could just stick with the single-threaded (and much simpler) approach.

like the above poster said, it depend on the number of request, and how long (complicate the request would takes).