NR Live Departure Boards and Bakerloo line trains

OK I wasn't sure where I should put this, but I looked at the live departure screen for Willesden Junction today, and clicked on a LUL train. It appeared that this train was being tracked across the network (or had been from Harrow and Weald as far as Willesden), just like a NR train would be.

Now, I always understood that the NR Live Departure board worked on a 'monitoring system' (according to NRs website anyway). I understand that this means there is 'monitoring points' located all over the railway, at stations, and between stations. All trains have some kind of 'beacon' which transmits the headcode (or similar). When the train passes a 'monitoring point' that is trackside, the on-board 'beacon' transmits the information to the 'monitoring point' which enters the NR computer system, and the station screens and live departure boards on NRs website, are updated.

If this is wrong please feel free to correct me.

When I looked at the screen a bit ago, it looked like the Bakerloo Line train was being tracked.

Here is a link (I hope- if I have done it right ) to a screen-shot www.babycakes.homechoice.co.uk/livedept.jpg

I wondered how the information on the Bakerloo lines trains get onto the NR live departure system? Are the Bakerloo line trains fitted with the equipment to communicate with the trackside monitoring points? Or is the Trackernet system linked to the NR system somehow?

Also if a Bakerloo line train was cancelled how would this information be put on the NR live departure system. Would the Bakerloo controller update it manually?

Thanks