Login without prompting for a password?

Is it possible to add a user so that when they login it doesn't prompt them for a password. Right now we have a limited user account that calls a menu program, and then kicks them out when they exit the menu, we have the user setup with a blank password right now but it still prompts for a password, and you just hit enter to login, but it would be even better if you could just type in the username and it would log you in. We used to be able to do this on UnixWare, right now we are in the middle of switching from UnixWare to SuSE on our servers and this is one of the little things that is bugging us yet... Rob