def request_absolute_cursor_position(self):
        """
        Get current cursor position.
        For vt100: Do CPR request. (answer will arrive later.)
        For win32: Do API call. (Answer comes immediately.)
        """
        # Only do this request when the cursor is at the top row. (after a
        # clear or reset). We will rely on that in `report_absolute_cursor_row`.
        assert self._cursor_pos.y == 0

        # For Win32, we have an API call to get the number of rows below the
        # cursor.
        if is_windows():
            self._min_available_height = self.output.get_rows_below_cursor_position()
        else:
            if self.use_alternate_screen:
                self._min_available_height = self.output.get_size().rows
            else:
                # Asks for a cursor position report (CPR).
                self.waiting_for_cpr = True
                self.output.ask_for_cpr()
Get current cursor position.
        For vt100: Do CPR request. (answer will arrive later.)
        For win32: Do API call. (Answer comes immediately.)