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By using FilePos and SeekFile the position within the file that is being read  or written can be determined and also changed. This allows a file to be read  and updated without having to make a new copy of the file or working through  the whole file sequentially. This could be useful if you have created a database  file and you want to find and update just a few records within it.

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The file handle that is returned is an integer value that the operating system  uses to identify