I need to kill an application roughly so I can get phantom subscriber of that application in my database (this can not be produced by closing the application). Manually, if
There are two ways:
Send WM_CLOSE to the target application if it has a window (hidden/visible). Task Manager's "End Task" uses this method. Most of the applications handle WM_CLOSE and terminate gracefully.
Use TerminateProcess API to kill forcefully - Task Manager's "End Process" uses this method. This API forcefully kills the process.
An example can be found here:
VB Helper: HowTo: Terminate a process immediately