The multiple file function Modify Boundaries of All Annotations is similar to the variant for the current document (see the section called “How to modify the boundaries of all annotations of selected tiers”). Except that there is no Undo and good backup copies of the files should be there. The files to process can be selected in a file browser or from a domain (see the section called “How to select multiple files”). The options in the second step are the same and the Finish button starts processing of all files. At the end of the process a short report lists which tiers in which files have been altered.