multiwire_display_dir_select_c (ul_multiwire)

	status.i4.v = multiwire_display_dir_select_c(top_row.i4.v,
						    left_column.i4.v,
					  	    selected_item.s.r 
						    [,user_req_sys_id.i4.v])

	This routine displays a directory of multiwire systems.  If the user 
	selects an item, it will return the selected multiwire system 
	information (display_index, display_name, and the number of scanners 
	in the system).

	top_row		top row of window (use WMNGR_CENTER for centering
			or WINDOW_xxx_COORD macros in macro for special
			positioning)
	left_column	left column of window (use WMNGR_CENTER for centering
			or WINDOW_xxx_COORD macros in macro for special
			positioning)
	selected_item	returned selected multiwire system information
			(MW_DSP_DIR structure)
	[user_req_sys_id]	requested multiwire system
				(MW_SYS_XXXXXX	-> desired system,			 
				CLIB_DEFAULT_ARG -> allow the user to 
				interactively select a system(default))

	This function returns status values as follows:

	OK		success
	CLIB_ABORT	user interrupted outside of menu
			(if user_req_sys_id = CLIB_DEFAULT_ARG, routine popped
			 a menu but the user interrupted outside of menu)			 
	CLIB_READ_ONLY  user selected an obsolate multiwire system
	CLIB_INVARG	invalid user_req_sys_id
	negative value	ACNET format error indicating overall failure

	This function requires the following include files:

	ul_multiwire_h:multiwires_h, acnet_errors_h

	Related functions:

	multiwire_display_config_c, multiwire_get_names_c,
	multiwire_menu_c, multiwire_get_data_c,
	multiwire_num_wires_c, multiwire_get_position_c,
	multiwire_set_position_c, multiwire_get_list_c,
	multiwire_cancel_get_lst, multiwire_get_scans_list_c,
	multiwire_detector_type_c, multiwire_get_power_status_c,
	multiwire_get_hv_status_c, multiwire_get_sequencer_status_c,
	multiwire_set_sequencer_status_c, multiwire_set_hv_status_c

	C/C++ usage:
	
	int	status;
	int	top_row = WMNGR_CENTER;
	int	left_column = WMNGR_CENTER;
	MW_DSP_DIR selected_item;
	int	user_req_sys_id = CLIB_DEFAULT_ARG;

	status = multiwire_display_dir_select_c(top_row, left_column,
					       &selected_item,user_req_sys_id);