As there is still some confusion over what you are trying to do, let me try and summarise for you - if I've got it wrong you can jump in.

  • You have one or more instances of an application running.
  • All instances use the same executable, so the underlying process has the same name.
  • You can determine which instance you want to kill by looking at the window title for the application (as displayed in the Applications tab of the task manager)
  • From the application window in task manager you can get the (primary) PID - right-click on application and choose "Go To Process"
  • You can now kill the associated PID