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The extension of SEPlib to handle parallel datasets has many unintended similarities to the parallel data capability of HDF (). A parallel dataset is a composition of several datasets with a master file describing the relationship between the various parts. All programming with the parallel dataset library is done through the superset library (). To handle parallel datasets with minimal changes to coding style requires a more abstract definition for IO than simple SEPlib or SEP3d allows. The library has both C and Fortran90 interfaces which allows almost any SEPlib code to be changed quickly. In this section I will describe how to interact how the library interacts with the various sub-datasets.