The features described in this topic are obsolete
and should not be used in new IDL code.

ONLINE_HELP

The following keywords to the three ONLINE_HELP procedures are obsolete.

HTML_HELP

Set this keyword to a non-zero value to indicate that the file specified by the BOOK keyword should be viewed with the HTML Help viewer. Explicitly set this keyword equal to zero to indicate that the file should be viewed with the traditional Windows help viewer.

Note
Normally, ONLINE_HELP can properly determine which viewer to use based on the name of the file, so use of the HTML_HELP keyword is rarely necessary.

FOLD_CASE

This keyword is only available on UNIX platforms.

Normally, the string given by the Value argument is folded to upper case before being handed to the IDL help viewer for display. Explicitly set FOLD_CASE=0 to indicate that the string should be handed to the help viewer without modification.

PAGE

This keyword is only available on UNIX platforms.

Set this keyword equal to a page number. Acrobat will open the specified page in the specified PDF file.

SUPPRESS_PLUGIN_ERRORS

Under Unix, if the IDL-Acrobat plug-in is not available for your current platform, ONLINE_HELP will issue warning messages explaining that it is unable to position the document, and that the user will need to manually navigate to the desired information once the Acrobat reader application is running. Set this keyword to prevent these warnings from being issued. On non-Unix platforms, this keyword is quietly ignored.

TOPICS

This keyword is only available on Windows platforms.

Set this keyword to display the Index dialog for the specified help file.