A third Party client is where the RS game loads but with extra information etc... provided by the programmer on the screen, usually the main things are an option to see all the RS worlds available and switch quickly between them ( although Jagex slow you down by making you wait if you switch to quickly :shame: ). It also has other helpful extras like maps of RS and a Chat client etc ...... i use Tiko (http://www.zybez.net/tiko.php) which i think is better than SS as it provides more ( or it did the last time i used SS anyway :-k ) and the treasure trail help on it is fab 8-)