The c-treeACE Server and c-treeACE clients on Unix systems now support a shared-memory communication protocol. We support 32-bit clients connecting to a 64-bit c-treeACE Server (and vice-versa) using the shared-memory protocol. We also support shared-memory connections to spin to improve the performance of a single connection. Using the shared-memory communication protocol on Unix has excellent performance results on most systems over TCP/IP.