[groove]

Each persons machine could be accessed through a fingerprint security scanner. For example, if one of you owes me a tenner towards lets say the Accyweb annual christmas get together, you would type in the ammount, then verify it by the machine scanning your thumbprint. That ammount would then be transfered from your account to mine. The police have similar devices to check peoples I.D in seconds. The machine would be useless to anyone else without your thumbprint and PIN number.