Determines a dialog's help file name usually without extension. It is assumed that the extension is ".chm". If the end user presses F1 in an active dialog, Natural first queries for a file with the value of HELP-FILENAME plus the extension ".chm". If HELP-FILENAME is not specified for the current dialog, the HELP-FILENAME of the parent dialog (if any) is used, if specified. This process is repeated as necessary until a top-level dialog is reached. If no non-empty HELP-FILENAME attribute is found for any of these dialogs, Natural searches for the file libraryname.chm, where libraryname is the name of the logon library.

The HELP-FILENAME attribute can also contain path information. If this is the case, then only that path is searched. If no path information is supplied, the help file is searched for in the logon library's RES subdirectory first, then in the RES subdirectory of each steplib, then in the directory assigned to the environment variable NATGUI_BMP.

Applies to	Dialog (all types).
Data Type	A253
Default Value	None
Possible Values	Any file name