使用API调用，参考 有谁共鸣 坛友的代码如下:
http://www.ad.siemens.com.cn/club/bbs/post.aspx?b_id=5&a_id=181641

#pragma code("user32.dll")

BOOL CloseWindow(HWND hWnd);

#pragma code()

BOOL bRet = FALSE;

HWND handle;

handle=FindWindow(NULL,"WinCC-Runtime - ");

bRet =CloseWindow(handle);

如果是中文版就用：
#pragma code("user32.dll")

BOOL CloseWindow(HWND hWnd);

#pragma code()

BOOL bRet = FALSE;

HWND handle;

handle=FindWindow(NULL,"WinCC-运行系统 - ");

bRet =CloseWindow(handle);