The program loads PDF documents (conforming to specification 1.6) and allows editing of several settings like the metadata about author, title, subject and keywords of the document. Furthermore, one can customize the viewer preferences, the bookmarks, the page labels, the page transitions for slide shows and the encryption/permissions of a document. As an alternative to the dialog-based user interface, the tool supports operating in batch mode (for usage in batch files or links). The full usage description of the command-line can be accessed via the "Help" button of the main dialog or by using the command-line parameter /?.