实现第三种所谓的图文相关的帮助其实并不难。有VB或DELPHI编程经验的同行一定记得很多控件有HelpType和HelpContext属性吧。用C语言直接调用HLP文件，实现上下文相关的帮助，直接跳到你所需的页面，也很简单：
#pragma code("user32.dll")
BOOL WinHelpA(hwnd, lpszHelpFile, fuCommand, dwData);
#pragma code()
#define HELP_CONTENTS 0x0003L

void WinHelpApi()
{
HWND hwnd; /* handle of window requesting help */
char HelpFile[255];
UINT fuCommand; /* type of help */
DWORD dwData; /* additional data */
BOOL bRetVal;
LPCTSTR lpszHelp;

lpszHelp = HelpFile;
strcpy(HelpFile, "c:\\Win.95\\Help\\Calc.hlp");
hwnd = FindWindow("PDLRTisAliveAndWaitsForYou","WinCC Runtime - ");
fuCommand = HELP_CONTENTS;
dwData = 0L;

bRetVal=WinHelpA((DWORD) hwnd,(DWORD) lpszHelp, fuCommand, dwData);

printf("hwnd: %d \r\n",hwnd);
printf("HelpFile: %s \r\n",HelpFile);
printf("bRetVal: %d \r\n",bRetVal);
}

其实困难的倒是编辑图文并茂的.hlp文件，因为你要计划好各个主题，并在WINCC的不同地方调用他们。