status.i4.v = window_insert_char_c(window_id.i2.v, row.i4.v, column.i4.v

	This routine will insert blanks in "row" of the window specified
	by "window_id" starting at "column".

	window_id	window ID (use WMNGR_BACKGROUND for background window)
	row, column	location to insert
	[num_chars]	number of characters to insert (default is 1)

	This function returns ACNET status values as follows:

	OK			success
	CBS_NO_WINDOW		requested window does not exist
	CBS_NOT_IN_WINDOW	insert field is not in the requested window
	CBS_MEMFAIL		dynamic memory allocation failure

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	window_delete_char_c, window_delete_line_c, window_insert_line_c,

	C/C++ usage:

	short	window_id;
	int	status;
	int	row = 1;
	int	column = 1;
	int	num_chars = 1;

	status = window_insert_char_c(window_id,row,column,num_chars);