I have a system that calls my app from the command line with differing parameters each time. I need to be able to start my app on the first call and thereafter just receive the different parameters on each subsequent call but also to remain open all the time. The system may call my app anywhere from 1to 5 times a second passing new parameters so the process will need to be quite fast. I have seen many different examples on the net but all seem overly complicated and most have the first instance of the app closing when the second call starts. Any help would be appreciated. Many Thanks.