diary, extendentry, freeentry, modifyentry, modifyentryline, showentry

diary "Title" [,"Source"]

Creates a new entry in the diary under the specified title.
For Source, fill in the ID of an info to use its text or enter a file name to load the text from it. If there is no parameter Source attached, the text from the buffer will be used and the buffer will be emptied right next.

extendentry "Title" [,"Source"]

Adds a string of text to the existing text of the diary entry with the specified name.
For Source, fill in the ID of an info to use its text or enter a file name to load the text from it. If there is no parameter Source attached, the text from the buffer will be used and the buffer will be emptied right next.

freeentry ["Title"]

Deletes the diary entry of the title that follows as a parameter. If there is no title specified, all entries will be deleted.

modifyentry "Title" [,"Source"]

Alters the text of the diary entry that carries the specified title.
For Source, fill in the ID of an info to use its text or enter a file name to load the text from it. If there is no parameter Source attached, the text from the buffer will be used and the buffer will be emptied right next.

modifyentryline "Title", Line, "Text"

Replaces a certain line of a diary entry by new text.

showentry "Title" [,SFX]

Displays the diary entry with that title. It also plays a diary sound by default. Set sfx to 0 if you don't want it to play that sound.