.topic  1000
Make two directories mirror each other, keeping the latest changes made to the files in either folder, including renaming and deleting files.

.topic 1001
Make one directory mirror another, including renaming and deleting files.

.topic 1002
Check a designated folder, and if changes have been made to the files, the updated files will be downloaded.

.topic 1003
Make all changes in the left folder to the right folder, without renaming or deleting any files.

.topic 1004
Make sure all files  exist in both folders, without renaming or deleting any files.