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        Because the TIB (thread information block) is not fully described in the
        MSDN, it might be possible that not all required TIB-parts are swapped. With
        compiler flag BOOST_USE_WINFIBERS
        execution_context uses internally
        the Windows Fiber API.
      
| ![[Note]](../../../../../../doc/src/images/note.png) | Note | 
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          The first call of  |