1. This procedure has to be used by a model to notify the manager of a queue of requests that it is ready for processing an HTTP request. After this call, as soon as a new request is available an event of class EVENT_HTTPNEW is sent to the model that can handle it as if it was running the HTTP server.

2. The model is flagged as available if no request is waiting in the queue. This flag is cleared when a request is passed to the model: it is therefore required to call the procedure again after a request has been processed.