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An area of user memory reserved for extended buffers, which can range in size from 32 words to the maximum size of the extended buffer pool. The extended buffer pool is used for data caching, directory caching and other system functions.; 一段供扩充缓冲器用的用户存储区。该区的范围可从32个字起直到扩充缓冲池最大容 量。这类缓冲池一般用作数据高速缓冲、目录高速缓冲或完成其它的系统功能。eXtend BUFfer pool的缩写。