+
+@section msg_ex_async Asynchronous communications
+
+ - <b>Waiting for all communications in a set</b>.
+ @ref examples/s4u/async-waitall/s4u_async-waitall.cpp\n
+ The @ref S4U_comm_waitall function is useful when you want to block
+ until all activities in a given set have completed.
+
+ - <b>Waiting for the first completed communication in a set</b>.
+ @ref examples/s4u/async-waitany/s4u_async-waitany.cpp\n
+ The @ref S4U_comm_waitany function is useful when you want to block
+ until one activity of the set completes, no matter which terminates
+ first.