blt_activate_spec

	status.i4.v = blt_activated_spec(machine.i4.v, spec_number.i4.v)

	This selects the appropriate machine then activates the BLT 
	Measurement Specification indicated by the value in spec_number.

	machine		BLT_TEVATRON, BLT_MAIN_INJECTOR, BLT_TEST or
			BLT_RECYCLER as defined in ul_cbsaux:bltuti.h
	spec_number	measurement specification number to activate

	This function returns ACNET status values as follows:

	OK			specification was activated without error.
	DIO_ERROR		an error occurred.

	This function requires the following include files:

	ul_cbsaux_h:bltuti_h, ul_clib_h:acnet_errors_h

	Related functions:

	blt_get_data, blt_get_pos, blt_get_pos_device,
	blt_get_tag, blt_is_fresh

	C/C++ usage:

	int	status;
	int	machine = BLT_TEVATRON;
	int	spec_num;

	status = blt_activate_spec(machine,spec_num);