The IXLLSTC, IXLLSTE, and IXLLSTM services support 31-bit and 64-bit addressable storage. The BUFFER keyword supports only 31-bit addressable storage areas (below 2GB). The BUFLIST keyword supports both 31-bit addressable and 64-bit addressable (above 2GB) virtual storage areas, depending on the specifications for the BUFADDRTYPE and BUFADDRSIZE keywords. However, pageable high shared virtual storage areas (above 2GB) may not be used.