vdata_id	IN:	Vdata identifier returned by VSattach
	record_pos	IN:	Position of the record

	Purpose	Provides a mechanism for random-access I/O within a vdata.
	Return value	Returns the record position (zero or a positive integer) if successful and FAIL (or -1) otherwise.
	Description	VSseek moves the access pointer within the vdata identified by the parameter vdata_id to the position of the record specified by the parameter record_pos. The next call to VSread or VSwrite will read from or write to the record where the access pointer has been moved to.
		The value of record_pos is zero-based. For example, to seek to the third record in the vdata, set record_pos to 2. The first record position is specified by specifying a record_pos value of 0. Each seek is constrained to a record boundary within the vdata.

	FORTRAN	integer function vsfseek(vdata_id, record_pos)
		integer vdata_id, record_pos