and that guy is formally required to be around until all child <code><a class="el" href="classipc_1_1session_1_1Session.html" title="A documentation-only concept defining the local side of an IPC conversation (session) with another en...">Session</a></code>s have been destroyed. So only session-scope arenas &ndash; the ones inside A and B &ndash; are relevant. In fact, for SHM-classic there really is only <em>one</em> arena: A holds a handle to it (<code>a.session_shm()</code> points to it), and B does so s