The HELP files format is the following
1 TOPIC
help for this topic
2 SUBTOPIC
help for a subtopic of the previous topic
1 OTHER_TOPIC
text for other_topic
1 ENDOFHELP
where 1 and 2 are in the first column of the text file, and followed by a
single space. This format is easy to modify as it is a simple text file,
but much slower to access because it is sequential. The 1 ENDOFHELP
(with no trailing characters) sequence indicates the end of the help file.
The help file name should be assigned to the logical name specified in the SIC_BEGIN call, or given explicitly.