How to register a Navigation Connector in EP6

Hi,
I am trying to build a navigation connector in EP6 SP2 and I see that the PDK documentation says "The Portal Development Kit (PDK) contains a navigation connector implementation to navigate to the content of the PDK." but I cannot find it anywhere.
I think I figured out how a navigation connector should look like, but I am stuck at one point: according to the PDK the navigation connector has to be registered in the afterInit() of the navigation connector service via a call of the registerConnector(String connectorKey, INavigationConnector connector)-method of the INavigationConnectorRegistration interface . What I cannot find out is how to get a reference to this INavigationConnectorRegistration ? Any help is greatly appreciated !
Thanks,
Heiko

Excellent, Detlev. Thanks. Your reply answers my posting, although some questions (in my mental representation) remain.
Specifically, I do not understand the separation of Navigation Service and Navigation Connector.
In my understanding my navigation iView retrieves a navigation tree structure from my navigation service.
Option 1:
in the getXXXNodes() methods of my navigation service I construct (from whatever source) a navigation tree structure (implementing INavigationNode/NavigationNodes). No need for a navigation connector here. Is that acceptable (though probably not recommended) behaviour ?
Option 2:
my navigation service in turn retrieves the navigation tree structure from a navigation connector which I built.
Three questions follow from that:
a) Do I (my navigation service, that is) select which connector should be used ?
b) If the answer to a) is yes, why is it then necessary to register my custom navigation connector at all ?
c) what is the role of the ConnectorKey with which I register my connector ? If I got a) and b) wrong, then somebody (who ?) must use this ConnectorKey and select the appropiate connector.
I am grateful for any advice.
Thanks.

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