With this command you can select a document frame.
The dialog box for opening files is opened. Choose the desired document frame and press OK. Now if you document the entire project, or print parts of your project, then in the program text there will be an insertion of the comment produced in the docuframe into all of the variables. This comment only appears in the printout!
To create a document frame, use the 'Extras' 'Make Docuframe File' command.