NDG_BEGGH - Begin a GRP NDF history block

Description:

This routine should be called to mark the start of a GRP NDF history block. The block should be ended by a matching call to NDG_ENDGH. See NDG_ENDGH for more details.

Note - GRP NDF history blocks must not be nested.

Invocation:

CALL NDG_BEGGH( STATUS )

Arguments:

STATUS = INTEGER (Given and Returned)

The global status.