There are two ways to provide help for a control:
Providing a help string in the control definition.
The help string is displayed in the help viewer when the user invokes on-item help for the control. The help string cannot include formatting (such as headings) or links.
To provide a help string, specify it in the control definition:
HELP_STRING help_string
Specifying a help topic in a registered help volume.
A help topic is information authored using the full capabilities of the help system. Authoring a help topic requires you to use the desktop Help Developer's Kit.
To provide a help topic, specify the help volume and topic ID in the control definition:
HELP_VOLUME help_volume_name HELP_TOPIC topic_id