wn_check_for_interrupt

	status.i4.v = wn_check_for_interrupt([int_screen.i4.r])

	This routine checks to see if an interrupt has occurred in a
	graphic window.  For this call to indicate that an interrupt has
	occurred, the graphic cursor must be active.

	[int_screen]	returned interrupt screen
			(default is NULL)

	This function returns ACNET status values as follows:

	TRUE			interrupt detected
	FALSE			no interrupt

	This function requires the following include files:

	cbslib_h

	Related functions:

	wn_interrupt_info, wn_cursor_update, wn_cursor_update_pixel,
	wn_cursor_init(_c), wn_cursor_init_pixel_c, wn_cursor_disable,
	intro_graphics_windows

	C/C++ usage:

	int	status;
	int	int_screen;

	status = wn_check_for_interrupt(&int_screen);