wn_erase_screen(_c)

	status.i4.v = wn_erase_screen_c(erase_color.i4.v)

	This routine erases the active graphics screen.

	erase_color	color plane(s) to be erased (different plane
			values can be ORed together)
			(WN_ERASE_ALL -> erase all planes,
			 WN_ERASE_BLUE -> erase blue plane only,
			 WN_ERASE_GREEN -> erase green plane only,
			 WN_ERASE_RED -> erase red plane only,
			 WN_ERASE_BLINK -> erase blink plane only)

	This function returns ACNET status values as follows:

	OK			success
	CBS_INVARG		invalid erase color

	This function requires the following include files:

	cnsparam_h, cbslib_h, acnet_errors_h

	Related functions:

	wn_erase(_c), wn_delete_c, wn_delete_all_c, wn_flush, wn_redraw_grid_c,
	intro_graphics_windows

	C/C++ usage:

	int	status;
	int	erase_color = WN_ERASE_ALL;

	status = wn_erase_screen_c(erase_color);