It is fully expandable (Although the output gets increasingly hard to extract) both for as many possible digits in the combination and as many digits per combination (You can also hit the same button multiple times per combo).
Quote from gustav165
Did you notice how old this thread is? Also that text can mean that he is playing in offline mode, his session has expired. He was probably playing in offline mode since the minecraft.net login server had a lot of problems around then.
Quote from Kyle Crafty
I'd do this, if my computer wasn't a toaster.
Quote from Blippop
The whiny adolescents who take their part ruining the community.
As for the game itself, I would say that the passive mobs are glitchy in SMP still; the damn sheep continually escape their compound.