[Nuprahtor]

OpenFile (filename$)

This command opens the designated file and prepares it to be updated. The file must exists since this function will not create a new file.

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.

В справке есть пример