i have tested the SerialTools.NET Solution for desktop usage. It works fine but can i show the virtual generated Port also in the device manager or where can i see them in my System? I would like to use it with a windows service, so how can i ensure, that my virtPort has always the same Number and is reserved only for my application. I have the impression that the port is only reserved so long the application is running. I need a reservation of a portnumber all the time, is this possible?