290 			for (wp = firstwin; --Prenum > 0; )  in do_window()
310 				wp = firstwin;	    // wrap around  in do_window()
379 		win_goto(firstwin);  in do_window()
864 	oldwin = firstwin;  in win_split_ins()
2291     for (wp = firstwin; wp != NULL && !ONE_WINDOW; )  in close_windows()
2302 	    wp = firstwin;  in close_windows()
2503     if ((firstwin == aucmd_win || lastwin == aucmd_win) && one_window())  in win_close()
2637 		    wp = firstwin;  in win_close()
2853     while (firstwin != NULL)  in win_free_all()
2854 	(void)win_free_mem(firstwin, &dummy, NULL);  in win_free_all()
3631     for (wp = firstwin; win_valid(wp); wp = nextwp)  in close_others()
3641 		nextwp = firstwin;  in close_others()
3653 			nextwp = firstwin;  in close_others()
3721     curtab->tp_firstwin = firstwin;  in win_alloc_first()
3832     firstwin->w_height = ROWS_AVAIL;  in win_init_size()
3834     firstwin->w_width = Columns;  in win_init_size()
3970 	firstwin->w_winrow = tabline_height();  in win_new_tabpage()
4189     tp->tp_firstwin = firstwin;  in leave_tabpage()
4193     firstwin = NULL;  in leave_tabpage()
4217     firstwin = tp->tp_firstwin;  in enter_tabpage()
4249     if (curtab->tp_old_Rows != Rows || (old_off != firstwin->w_winrow  in enter_tabpage()
5237 	before = firstwin;  in win_append()
5244 	firstwin = wp;  in win_append()
5264 	firstwin = curtab->tp_firstwin = wp->w_next;  in win_remove()
5352     if (firstwin == NULL)	// not initialized yet  in shell_new_rows()
5380     if (firstwin == NULL)	// not initialized yet  in shell_new_columns()
6610     if (firstwin == NULL)	// not initialized yet  in min_rows()