The nodeName is a 12 character ASCII string that is unique to every
Passport module in a Passport network. This name is the component
instance value of EM - the root of the Passport component
hierarchy. It has, therefore, the same restriction and behaviour as
any ascii string instance value, e.g., it is converted to upper case.
Note that the EM component is typically suppressed on output.
Changing the value of the nodeName will cause the node to restart.