status.i4.v = error_display_popup_c(top_row.i4.v, left_column.i4.v,
					    message.i1a.r, error_type.i4.v,
					    error_code.i4.v [,color.i4.v]

	This routine displays an error code and/or message in a
	popup window.    This routine will return a value of ERR_ERROR
	if "error_code" is an error (depends on "error_type") or
	ERR_OVFLOW if the same error has been repeated for more than five
	times.  If the overflow condition occurs, the error will not be
	displayed.  If specified in the most recent call to error_init(_c),
	this routine will also write to an error log file.  A previous call
	to error_init(_c) is necessary.

	top_row		top row of menu (use WMNGR_CENTER for centering
			or WINDOW_xxx_COORD macros in macro for special
	left_column	left column of menu (use WMNGR_CENTER for centering
			or WINDOW_xxx_COORD macros in macro for special
	message		null terminated message (ERR_MAXLEN character max)
	error_type	type of error
			(ERR_NONE -> no error, just a message,
			 ERR_ACNET -> "error_code" is an ACNET error,
			 ERR_INT -> "error_code" is a simple integer value,
			 ERR_SYS -> "error_code" is a VMS error code,
			 ERR_RTL -> "error_code" is a C RTL (errno) error code,
			 ERR_DEVNAM -> "error_code" is an ACNET device index,
			 otherwise -> "error_type" is interpreted as an ACNET
				      device index and "error_code" is treated
				      as an ACNET error)
	error_code	error code to display
	[color]		display color (default is RED if "error_code"
			indicates an error condition and CYAN otherwise)
			(constants are in 'cnsparam')
	[priority]	log entry priority value
			(default is ERR_DEFAULT_PRIORITY)

	This function returns status values as follows:

	ERR_OK			"error_code" is not an error
	ERR_ERROR		"error_code" is an error  (This is
				nonzero for integer or ACNET "error_type"
				and any value but 1 for VMS "error_type".)
	ERR_OVFLOW		"error_code" is an error, but error
				clipping is on and this device/error
				combination has already occurred too
				many times to be displayed
	ERR_NO_INIT		error_init(_c) has not been called

	This function requires the following include files:

	cbslib_h, cnsparam_h, acnet_errors_h

	Related functions:

	error_display_c, error_printf_c, error_message(_c), error_mprintf_c,
	error_colored_message_c, error_cmprintf_c, error_init(_c),
	error_imbedded_enabled, error_imbedded_on, error_imbedded_off,
	error_erase, error_close, error_last, error_clip_depth_c,
	error_query_clipping, error_trace_on, error_trace_off,
	error_trace_get, error_trace_view_c, error_size_and_position_c,
	error_is_occluded, error_window_is_present, intro_error

	C/C++ usage:

	static const char	message[] = "This is an error message.";
	int	status;
	int	top_row = WMNGR_CENTER;
	int	left_column = WMNGR_CENTER;
	int	error_type = ERR_ACNET;
	int	error_code = ACNET_PEND;
	int	color = RED;
	int	priority = ERR_DEFAULT_PRIORITY;

	status = error_display_popup_c(top_row,left_column,message,error_type,