The server is capable of supporting up to sixteen simultaneous transactions. It services concurrent client requests in a true multi-threaded mode, overlapping network I/O and external script execution. This does not require installation of Win32s (which doesn't support multi-threading anyway).
If a connection request is received while 16 clients are already being handled, the server replies with a short HTML-formatted message indicating that the server is too busy at the moment. This keeps users from thinking that the server is broken when it is really just too busy.