Fancy diary display also has the ability to process included diary files. This permits a group of people to share a diary file for events that apply to all of them. Lines in the diary file of this form:
includes the diary entries from the file filename in the fancy diary buffer. The include mechanism is recursive, so that included files can include other files, and so on; you must be careful not to have a cycle of inclusions, of course. Here is how to enable the include facility:
(add-hook 'list-diary-entries-hook 'include-other-diary-files) (add-hook 'mark-diary-entries-hook 'mark-included-diary-files)
The include mechanism works only with the fancy diary display, because ordinary diary display shows the entries directly from your diary file.