> Note that when running on Linux when _not_ under a debugger, the 
> default for SIGTRAP is to get a coredump:
>   Trace/breakpoint trap (core dumped)
> so people should be strongly discouraged from adding these calls to
> their code.
Looks like Windows' DebugBreak has similar behavior here; according to:
  http://msdn.microsoft.com/en-us/library/ms679297(VS.85).aspx
"If the process is not being debugged, the function uses the search logic of a standard exception handler. In most cases, this causes the calling process to terminate because of an unhandled breakpoint exception."