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How do I enable HDF5 output in Marc?

How do I enable HDF5 output in Marc? Is there a Patran hook that I'm missing? If I have to edit the .dat (either directly or via Patran) can you give me an example? It's just not clear from the docs how to use HDFPOST and/or HDFOUT in the input file.
 
I'm familiar with the NASTRAN input file structure so the MARC structure is unfamiliar to me right now.