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-------------------------------------- Argument list:WHAT(1), (2), (3), (4), (5), (6) : user-given numerical parametersSDUM: user-given character string (8 characters) Subroutine USRGLO is called before any other initialisation is done by the program, provided a command USRGCALL is present anywhere in the input. The calling parameters can carry any kind of useful information or can be used as flags to choose between different possible actions to be performed before any particle transport takes place.