o  last observed skew

    Specifies the skew between the node's clock and the time
    received from the specified global server after the most recent
    synchronization.

 o  last observed time

    Specifies the time the node last received from the specified
    global server.

 o  last time polled

    Specifies the time that the node last solicited a time value from
    the specified global server.

 o  used in last synchronization

    Specifies whether or not a time value from the specified global
    server was used in the node's last clock synchronization.