The policy is worded as follows:
You are entitled to admission during normal operating hours to the following Theme Parks as well as Theme Park parking (excluding special events requiring separate admission charge) and the freedom to visit multiple parks on the same day:
Disney's Animal Kingdom Theme Park
Disney-MGM Studios
Epcot
Magic Kingdom Park
Source: AP Passholder booklet
Enforcement, like so many policies relating to Disney, varies from CM to CM.