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TPU$FILEIO

   The TPU$FILEIO routine handles all TPU file operations.
   Your own file I/O routine can call this routine to perform some
   operations for it. However, the routine that opens the file must
   perform all operations for that file. For example, if TPU$FILEIO
   opens the file, it must also close it.

   Format

     TPU$FILEIO  code ,stream ,data

Additional information available:

Returns         Arguments       Description     Condition_Values_Returned