The left side will show you the files that exists in the From directory and are newer than files existing in the To directory.

If you click the Update button on the top of this list (also shows an arrow pointing to the other side), Comparator Fast will update (copy) all selected files to the other side. If you didn't selected any file at all, Comparator Fast will update (copy) all files on the list.

A log of this process is created. You may click the same Update button again to Stop updating (copying) process (if this happens during copy of a large file, you need to click the Cancel button on the copy progress window).

The right side will show you the files that exists in the To directory and are newer than files existing in the From directory.

If you click the Update button on the top of this list (also shows an arrow pointing to the other side), Comparator Fast will update (copy) all selected files to the other side. If you didn't selected any file at all, Comparator Fast will update (copy) all files on the list.

A log of this process is created. You may click the same Update button again to Stop updating (copying) process (if this happens during copy of a large file, you need to click the Cancel button on the copy progress window).