Identifies the name of the help file with which all tags are to be associated. VTS then uses the identified help file, along with a specified topic ID to locate and open specific help topics that pertain to the selected tag, or possibly to the tag's type. (For example, a help topic that pertains specifically to digital input tag "DI20_1", or a help topic that pertains to digital input tags in general.)
Once a help file is associated with an application via the HelpFile variable, it is necessary to identify the help topic (within that help file) to access for a selected tag. This is done using a "topic ID" – a unique index number assigned to each topic in the help file by the help author.
Topic IDs can be entered into the Help Search Key property that appears on the ID tab of the tag properties folder for all tag types. This enables developers to associate each tag with specific help topics existing within the help file specified by the HelpFile variable.
Once each tag has had a topic ID entered into its Help Search Key property, the associated help topic can be accessed by users in one of two ways:
By right-clicking the tag's drawing method and selecting the Help option from the shortcut menu.
By clicking the Help button that appears between the OK and Cancel buttons on each tag's properties folder.
Default: HelpFile = VTSGuides