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Every SimGrid simulation entails a distributed application, that
-virtually executes on the simulated platform. This application can
-be either an existing MPI program (if you use the SMPI interface), or
-a program specifically written to execute within SimGrid, using one of
-the dedicated APIs.
-
-
-.. include:: app_smpi.rst
-
-.. include:: app_legacy.rst
-
-.. toctree::
- :hidden:
-
- The S4U Interface <app_s4u.rst>
+virtually executes on the simulated platform. You can express this
+application using one of the following interfaces. It is even possible
+to mix several interfaces in the same simulation.
+
+ - :ref:`Describing Algorithms with the S4U interface <S4U_doc>` (in C++ or Python)
+ - :ref:`Simulating existing MPI programs with the SMPI toolsuite <SMPI_doc>`
+ (in C, C++, or Fortran)
+ - In some cases, you may want to replay an execution trace in the simulator. This
+ trace lists the events of your application or of your workload, and
+ your application is decomposed as a list of event handlers that are
+ fired according to the trace. SimGrid comes with a built-in support
+ for MPI traces (with solutions to import traces captured by several
+ MPI profilers). You can reuse this mechanism for any kind of trace
+ that you want to replay, for example to study how a P2P DHT overlay
+ reacts to a given workload.
+ - A prototypal tool is intended to allow the modification of any existing
+ application so that it can run on top of SimGrid. This project,
+ called `Remote-SimGrid
+ <https://framagit.org/simgrid/remote-simgrid>`_, is somewhat
+ experimental but should be already usable.
+
+As you can see, SimGrid is very modular and can be used in many
+ways. We are working to improve it along two main directions. First,
+we plan to further increase the modularity of the simulator so that
+users can invent the specific API or DSL they need for their usage. We
+call this project BYOS: Build Your Own Simulator.
+
+Executing existing applications within the simulator is another
+long-term goal. SMPI and Remote-SimGrid already allow you to execute some
+applications, but our long term goal would be to allow for the execution
+of any legacy application, with absolutely no modification. We call it
+SimOS, even if it will not become usable before several years of
+additional work.
