file_id

IN:

File identifier returned by Hopen

	Purpose	Initializes the AN interface.
	Return value	Returns the AN interface identifier (an_id) if successful and FAIL (or -1) otherwise.
	Description	ANstart initializes the AN interface for the file identified by the parameter file_id. A call to ANstart is required before any AN functions can be invoked. ANstart is used with the ANend function to define the extent of AN interface session. A call to ANend is required for each call to ANstart.

	FORTRAN	integer function afstart(file_id)
		integer file_id