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1. Service Advertising Protocol: A protocol used by NetWare Loadable Modules (NLMs) to inform clients of a server's presence. Servers advertise their services, by both name and type, with Service Advertising Protocol (SAP), allowing routers to create and maintain a database of current internetwork server information. This information goes to all nodes on an IPX network.2. service access point: A virtual port on a data link adapter. A SAP provides communication points between adjacent local area network (LAN) protocol layers. A SAP is referred to by a three-digit hexadecimal number.3. secondary audio program.