close another app not in TaskBar, visible only in TaskTray?

Thanks in advance!
I use the following code to open/kill another app:
But how can i close another app that isn't in TaskBar, and is visible only
in TaskTray?
**
   AppHandle:=FindWindow(Nil, PCHAR(ssName2));
   if (AppHandle <> 0) Then
       Result:=PostMessage(AppHandle, WM_QUIT, 0, 0)
   ELSE Begin
                ExecuteThis := (AppPath + ssLnk2);
               ShellExecuteThis(ExecuteThis);
           End;
**
Thanks!


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