entry.i4.v = window_row_to_entry_c(window_id.i2.v, row.i4.v

	This routine allows the programmer to calculate the proper entry
	number in the user's memory that corresponds to a given row in
	a scrolling window.

	window_id	ID of desired window
	row		window row number
	[start]		first entry number (default is zero)

	This function returns status values as follows:

	CBS_INVARG		invalid window ID or row
	CBS_NO_WINDOW		window doesn't exist
	otherwise		corresponding entry number

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	window_entry_to_row_c, window_current_row_c, window_last_io_location_c,
	window_is_in_scroll_buffer_c, window_next_scroll_row_c,
	window_scroll(_c), window_tvm(_c), window_tvmx(_c),
	window_virtual_column_c, window_physical_column_c, window_hscroll_c

	C/C++ usage:

	short	window_id;
	int	entry;
	int	row = 5;
	int	start = 0;

	entry = window_row_to_entry_c(window_id,row,start);