IFNOT STATEMENT ifnot (object o = find_player(NAME)) { write("You can't go there when "+NAME+" isn't online!\n"); return 1; } ifnot(expr) is equivalent to if(!(expr)). In some cases it makes things more readable, that's all. The above is one such typical example. This is a simulated LPC extension done via /include/auto.h . See also: LPC/if, LPC/unless