Note: If your interest is in creating a network application based on sockets, TLI, or streams, this chapter offers little but background information. Refer to the IRIX Network Programming Guide, document Number 007-0810-050, for a complete review of all application-level services. Even if your interest is in creating a kernel-level network driver, you should be familiar with the facilities documented in the IRIX Network Programming Guide. This chapter assumes that your are familiar with them.