Tip Rating (26):

{For Windows 9x/ME/2000/XP }

uses
  Tlhelp32;

function KillTask(ExeFileName: string): Integer;
const
  PROCESS_TERMINATE = $0001;
var
  ContinueLoop: BOOL;
  FSnapshotHandle: THandle;
  FProcessEntry32: TProcessEntry32;
begin
  Result := 0;
  FSnapshotHandle := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
  FProcessEntry32.dwSize := SizeOf(FProcessEntry32);
  ContinueLoop := Process32First(FSnapshotHandle, FProcessEntry32);

  while Integer(ContinueLoop) <> 0 do
  begin
    if ((UpperCase(ExtractFileName(FProcessEntry32.szExeFile)) =
      UpperCase(ExeFileName)) or (UpperCase(FProcessEntry32.szExeFile) =
      UpperCase(ExeFileName))) then
      Result := Integer(TerminateProcess(
                        OpenProcess(PROCESS_TERMINATE,
                                    BOOL(0),
                                    FProcessEntry32.th32ProcessID),
                                    0));
     ContinueLoop := Process32Next(FSnapshotHandle, FProcessEntry32);
  end;
  CloseHandle(FSnapshotHandle);
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  KillTask('notepad.exe');
end;

{ For Windows NT/2000/XP }

procedure KillProcess(hWindowHandle: HWND);
var
  hprocessID: INTEGER;
  processHandle: THandle;
  DWResult: DWORD;
begin
  SendMessageTimeout(hWindowHandle, WM_CLOSE, 0, 0,
    SMTO_ABORTIFHUNG or SMTO_NORMAL, 5000, DWResult);

  if isWindow(hWindowHandle) then
  begin
    // PostMessage(hWindowHandle, WM_QUIT, 0, 0);

    { Get the process identifier for the window}
    GetWindowThreadProcessID(hWindowHandle, @hprocessID);
    if hprocessID <> 0 then
    begin
      { Get the process handle }
      processHandle := OpenProcess(PROCESS_TERMINATE or PROCESS_QUERY_INFORMATION,
        False, hprocessID);
      if processHandle <> 0 then
      begin
        { Terminate the process }
        TerminateProcess(processHandle, 0);
        CloseHandle(ProcessHandle);
      end;
    end;
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  KillProcess(FindWindow('notepad',nil));
end;

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