> 
> Is there a specific signal that could be sent to Blackbox and make
> Blackbox do exactly the same thing as if a user had clicked [exit]
> from within Blackbox ?
> 

  case SIGSEGV:                                                                
  case SIGFPE:                                                                
  case SIGINT:                              
  case SIGTERM:                             
    shutdown();

says the blackbox code.  SIGPIPE may or may not appear in that list soon.

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