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  Name:     flen() - length of a file associated with a handle
  Usage:    <integer> = flen(<handle>)
  Params:   integer <handle> from a previous fopen() or fcreate()
  Returns:  integer equal to the length of the file, -1 for error

 ---------------------------------- Example ---------------------------------

                 handle = fopen("test.txt")
                 fseek(handle,(flen(handle)))
                 fwrite(handle, "This is now at the end")
                 fclose(handle)