What Does Service Advertising Protocol (SAP) Mean?

Service Advertising Protocol (SAP) is an automated internetwork packet exchange (IPX) protocol component for adding and removing services. It is mostly implemented by system administrators and application developers.

Techopedia Explains Service Advertising Protocol (SAP)

At startup, server operating systems (OS) broadcast SAP services to all IPX networks through SAP agents. During shutdown, SAP communicates service unavailability. Then, each SAP agent applies data and service changes for server information table maintenance.