status.i4.v = bpm_lock_tbt_buffer_c(house.ch.d, lock_it.i4.v)

	This routine locks or unlocks the BPM turn by turn data buffer.

	house		ASCII house name (If a value of NULL is passed for
			this argument, all buffers for the present machine
			will be locked/unlocked.)
	lock_it		flag indicating whether to lock or unlock the
			turn by turn data buffer
			(TRUE -> lock turn by turn buffer,
			 FALSE -> unlock turn by turn buffer)

	This function returns ACNET status values as follows:

	OK			success
	CBS_NOTYET		not supported for the currently selected
	CBS_INVARG		invalid house name
	otherwise		other ACNET error

	This function requires the following include files:

	ul_cbsaux/bpmuti.h, cnsparam_h, acnet_errors_h

	Related functions:

	bpm_machine_c, bpm_read_tbt_buffer_lock_c, bpm_set_global_tbt_timing_c,
	bpm_set_tbt_timing_c, bpm_get_tbt_timing_c, bpm_get_global_tbt_timing_c,
	bpm_enable_tbt_trigger_c, bpm_is_tbt_trigger_enabled

	C/C++ usage:

	static const char	house[] = "A1";
	int	status;
	int	lock_it = FALSE;

	status = bpm_lock_tbt_buffer_c(house,lock_it);