The NIDL compiler translates an NIDL interface definition into the NCS client and server stub modules. Before the C/C++ for z/OS® compiler can be run on NCS-based code, any $ (such as those in the NCS RPC run-time library routines) must be converted to an underscore (_). You can use CPP to do this conversion. For more information about CPP, see Converting C identifiers using the CPP program.