All help systems generated by Macrobject Help Authoring Suite support Help API.  You can use the API to show a specify topic via its URL, or a mapid (HelpId).  Also you can show a specify panel in the help systems, such as content tab, index tab or search tab.  For all Microsoft Compiled HTML Help (CHM) format (CHM Classic and CHM Modern) you can call the Help API via command line or DLL.  For Web Help format, you can call the API via command line with parameters.  With the parameters, you can show a specify URL, or HelpId, or Alias and other feature supported by CHM.