/// <param name="command">The playback command.</param>
/// <exception cref="ArgumentNullException"><paramref name="clientAppId"/> is null.</exception>
/// <exception cref="ArgumentException"><paramref name="command"/> is invalid.</exception>
/// <param name="command">The playback command.</param>
/// <exception cref="ArgumentNullException"><paramref name="clientAppId"/> is null.</exception>
/// <exception cref="ArgumentException"><paramref name="command"/> is invalid.</exception>