bool FileSeek	(	int	handle,
		int	offset,
		int	origin
	)

Moves the position of the file pointer by a specified number of bytes relative to the specified position

Parameters

handle	File descriptor returned by FileOpen()
offset	The shift in bytes (may take a negative value)
origin	The starting point for the displacement. Can be one of the following values: SEEK_SET File beginning SEEK_CUR Current position of a file pointer SEEK_END File end

Returns

If successful the function returns true, otherwise false. To obtain information about the error call the GetLastError() function

If the execution of the FileSeek() function results in a negative shift (going beyond the "level boundary" of the file), the file pointer
will be set to the file beginning.
If a position is set beyond the "right boundary" of the file (larger than the file size), the next writing to the file will be performed not from
the end of the file, but from the position set. In this case indefinite values will be written for the previous file end and the position set.