Provides a topic number for the help file provided by $ObjErrHelpFile.
Number (LONGINT). Can be reset by an application program.
The variable provides a topic number for the help file provided by the $ObjErrHelpFile. This topic number does not apply to all help files formats. This variable is set to $null when a component operation triggers a Zim error but is set to a meaningful value when a Zim 5207 error is encountered.