(V.2.1, undocumented prior to V.2.1.3) IPCName, defaulting to FIREBIRD since V.2.0, is the kernel namespace where the XNET instance for direct local connection on Windows is created. On Vista and some other Windows platforms, it was usually necessary to edit this parameter to add the prefix “Global\” in order to ensure that the local client running under a restricted account would have the authority to create this namespace.

A change in V.2.1 made it so that the connection routine would apply the prefix to the default IpcName unconditionally if the user's first attempt failed due to restricted permissions.