/*!
\page parallel Parallelism 

\section para-over Base elements

Several classes and methods are available in the MED library to ease the exchange of information
in a parallel context.
For historical reasons, they are all in the same namespace as the non-parallel MEDCoupling functionalities,
<b>%ParaMEDMEM</b>.

The core elements of the API are:
- \ref ParaFIELD-det "ParaFIELD", the parallel instanciation of a MEDCoupling field
- \ref CommInterface-det "CommInterface", communication interface to the gateway to the MPI library
- \ref MPIProcessorGroup-det "MPIProcessorGroup", a group of processor in a parallel computation

along with all the DEC explained below.

\section para-dec Data Exchange Channel - DEC

A Data Exchange Channel allows the transfer of information between two processor groups.
There are several variants of DEC depending on what you are aiming at:

- \ref DisjointDEC-det "DisjointDEC"
- \ref InterpKernelDEC-det "InterpKernelDEC"
- \ref NonCoincidentDEC-det "NonCoincidentDEC" 
- \ref OverlapDEC-det "OverlapDEC"
- \ref ExplicitCoincidentDEC-det "ExplicitCoincidentDEC"
- \ref StructuredCoincidentDEC-det "StructuredCoincidentDEC"
 
  TODO: more on DEC.


*/