You can customize resolver functions, or enable or disable certain resolver functions, by using resolver configuration statements in a resolver setup file. For example, you can control which resolver statements are used by all applications or TCP/IP stacks for name resolution by specifying the GLOBALTCPIPDATA statement (see The resolver setup file for more information about the statements that are supported by the resolver setup file). If you want to customize resolver functions, you must create a resolver setup file and define the resolver address space.