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1. Local sessions

   Covers Publishing media sessions, MediaSessionRepresentable, MediaSession, MediaSessionError.

2. Remote sessions

   Covers Publishing remote media sessions, RemoteMediaSessionRepresentable, RemoteMediaSession, RemoteMediaSessionExtension.

3. Playback

   Covers MediaPlaybackSnapshot, Content types and metadata, Playback commands.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

• Nearby Interaction System
• Network System
• Network Extension System
• NetworkingDriverKit System
• Notary API Web
• Notification Center App Services
• Objective-C Runtime App Frameworks
• Observation App Frameworks
• Open Directory System
• OpenGL ES Graphics and Games
• os System
• OSLog System