Start: 48.73829, 13.41383
64D COUNTR DES_CS SBRM ; CS.base = selector
，这一点在下载安装 谷歌浏览器 开启极速安全的 上网之旅。中也有详细论述
List checkpoints with sizes
strict (default): Rejects writes when the buffer is full and too many writes are pending. Catches "fire-and-forget" patterns where producers ignore backpressure.