Af-Key structure representation.
This object is used to define the current af-key been used for the Af-Arch user connected using a particular connection.
The structure have the user name, the server name this Af-Key applies, a time stamp and a hash with current permission the user have.
Actually this is not necessary to be used while programming server components. However, if the service needs to perform some special operation according to actual permission status, this type will be used.