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|ONC+ Developer's Guide Oracle Solaris 11.1 Information Library|
An application based on either TCP or UDP can run in binary-compatibility mode. For some applications you only recompile and relink all source files. Such applications might use simple RPC calls and use no socket or TCP or UDP specifics.
You might need to edit code and write new code if an application depends on socket semantics or features specific to TCP or UDP. For example, the code might use the format of host addresses or rely on the Berkeley UNIX concept of privileged ports.
Applications that are dependent on the internals of the library or the socket implementation, or applications that depend on specific transport addressing, probably require more effort to port and might require substantial modification.