HTMLHELP12
When HTMLHelp12 is defined the interface unit assumes HTML Help version 1.2. Features which we're droppes from version 1.1 are not available, features introduced with version 1.2 are. Also, some of the constant names changed going from HTML Help 1.1 to 1.2. This directive is mutually exclusive with HTMLHELP11. For the exact differences between version 1.1 and 1.2 search the interface unit for "$IFDEF HTMLHELP11" and "$IFDEF HTMLHELP12".