This command is used to invoke online help for error messages.

This command is not executable in batch mode.

HELP Displays the help menu.
HELP [NAT]nnnn Entering HELP and a number (up to 4 digits, optionally prefixed by "NAT") displays the detailed message text for the Natural error condition associated with that number, that is, the long text of the Natural system error message NATnnnn.
HELP USERnnnn Displays the long text of the library-specific error message number nnnn in the current library.