Mac OS X HID Manager provides a callback whenever there is something  
in the event queue.  Ideally, there would be a way to have HID  
Manager call a function whenever new data arrives, instead of polling  
the queue.
Is this possible in Pd?  Any example code anywhere?  IIRC, I thought  
netsend/netreceive worked something like this.
.hc
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As we enjoy great advantages from inventions of others, we should be  
glad of an opportunity to serve others by any invention of ours; and  
this we should do freely and generously.         - Benjamin Franklin