Nobody can know your ID or password if you don't provide them in the first place. Backdoors.To never asks for your Yahoo! ID or password; they merely provide a comprehensive list of direct links to Yahoo! game rooms (and other play sites too), in a nice and easy-to-use layout, and accessible all the time.
Even when there is a need to login to Yahoo!, Backdoors.To site just put a link for your convenience to the login page at Yahoo! i.e. you actually login (and provide your ID and password) at Yahoo!, and not at Backdoors.To site.
Backdoors.To was developed by our associates, and they are trustworthy. And I assure you there are no tricks at all on this site.