Editing multiple files and analysis of multiple files

Normally ELAN allows to edit only a single file at a time. There are situations in which it is convenient to edit multiple files at once. The menu item File > Multiple File Processing gives a number of options to do just this. When selecting either of them, you are warned that you should have copies of the files you are going to work on in case you want to restore the files (there is no Undo for multiple file edits).