+ host. Some executions can be given an higher priority so that they
+ get more resources.
+
+ - <b>Asynchronous execution</b>.
+ @ref examples/s4u/exec-async/s4u-exec-async.cpp \n
+ You can start asynchronous executions, in a way that is very
+ similar to asynchronous communications.
+
+ - <b>Monitoring asynchronous executions</b>.
+ @ref examples/s4u/exec-monitor/s4u-exec-monitor.cpp \n
+ This example shows how to start an asynchronous execution, and
+ monitor its status.
+
+ TODO: add an example about parallel executions.
+
+@section s4u_ex_actors Acting on Actors
+
+ - <b>Creating actors</b>.
+ @ref examples/s4u/actor-create/s4u-actor-create.cpp \n
+ Most actors are started from the deployment XML file, but there is other methods.
+ This example show them all.