Hi,

   This might be a very silly question: I am writing a multi-threaded 
application and am using my custom build (default flags) of HDF5 v1.8 of the 
C++ API. Can two threads simultaneously create private H5Group instances 
within a common H5 file and coherently write datasets into their respective 
H5Groups? I am tempted to assume this is not possible but I hear of parallel 
I/O and HDF5 so I could use some clarification.

    Also, am I right in understanding that parallel HDF5 I/O is possible only 
in an MPI context and that the PHDF5 must be built separately with MPI build 
info? Is it the same source code?

Thanks for being patient,
Manoj

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