An NG/AMS Server is a multithreaded application, which can execute many requests (HTTP request) in parallel. It is for instance possible to execute Archive Push and Pull Requests in parallel with Retrieve/Processing Requests and to request information about the system at the same time. Of course, if too many parallel requests are executed, the performance of the system will go down. A configuration parameter is used to specify the maximal number of parallel requests that can be handled. If more are received, additional requests will be rejected.