[interfacekit] BHandler::StartWatching()

Hi,

Ingo and I had a longer discussion about BHandler's StartWatching() 
functionality - though Ingo was apparently right (and the BeBook is 
really clear on that point, too), OpenTracker seems to work anyway 
which uses the way I thought that functionality would work (which was 
inspired by the OpenTracker source).
Although we can't say anything about that, Ingo found out that the 
handler to be notified receives a message 'OBST' when the observation 
starts, and 'OBSP' when the observation stops (those messages actually 
lead me to think that the target BHandler would register the other 
handler to be notifed, not vice versa, as it is).

To cut a long story short, the current OpenBeOS implementation doesn't 
do that yet :-)

Adios...
   Axel.

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