By the 'other board' I mean the 'official' Arduino WiFi shield; it does almost everything I want (by reading the documentation); I haven't bought any of those Wifi shields yet but I can't find any documentation for the Async Labs shield whatsoever; especially nothing for those uip*.cpp and uip*.h files; I don't want to hack my way through it just to find out that the shield can't do what I want/need (my requirements aren't that demanding though 
kind regards,
Jos