I was wondering recently if it is possible to create an annotated version of a pdf presentation. Two purposes -- the presenter uses it as notes while they talk,

I was wondering recently if it is possible to create an annotated version of a pdf presentation. Two purposes -- the presenter uses it as notes while they talk, and when the slides get put up, people who read them get to read the annotations too. But in the presentation itself, you only see the slides, not the annotations.