Are you saying that you do see it in the sessions (or do not?)
If you are on windows you can open the task manager and kill ESSSVR session on that application (View -> Select Columns -> Command Line)
If you are on *nix then ps command will show you the app name, kill the process id associated with it.
I tried in 2 ways, which are actually helped
alter system logout session on application 'appname' force; - this will help 90% of times.
If above didn't not help I kill session from server then run the same above statement, then it kills 95% of times
The ultimate way to stop application irrespective of whether calc running or dataload running is
to kill "ESSSVR" process of application specific. now it kills 100% and stops application, I give 2 min refresh time, then start application.
Thanks for all your replies guys