Here I have added a user "Domesday" using the "A" option on the previous screen. I am now editing the details of the user and I have given "Domesday" a password of "Domesday", system privilege, a personal account of 1 and access to all the group accounts.

The MDFS has a sophisticated system of account numbers. Each user can have a Personal Account number allocated as well as access to a range of group accounts. Files and directories on the MDFS have an account number and auxiliary account number associated with them, which allow them to be modified by users with those account numbers as their Personal Account.

But more of that another time!