WinCC and OPC application

Hi All,

I have an application in VB.net that converts values from a txt file to OPC Items which can be used in WinCC.
The app runs quiet well, but now I need to find a way to start this app from WinCC (the easy part) but also needs to shutdown automatically when WinCC goes down (runtime).
Any ideas?

A simple way is to close it on mouse pressed, while you exit wincc with mouse released...

A more complicated is to use a wincc built in function that executes on exit, but I'm not sure how is it called...