With FSUIPC.DLL correctly installed, and Flight Simulator running and ready, look at the Menu. (Press ALT to bring it up if it is hidden). There should be a “Modules” item, probably the vary last word at the right-hand end of the menu. Select it. You should then see “FSUIPC …”. If you don’t, press ESC to get out of the menu, wait a few seconds, and then try again. If you still don’t see it, then either you have not installed FSUIPC.DLL correctly or there is an older version running
after you open FSUIPC click on the
"Register an application program" button, and the details can be entered into a dialogue box
Once this is done and accepted, the relevant program can be run without restarting FS—but if that program is already running it will have to be restarted