SAP

1) service access point

A field defined by the IEEE 802.2 specification that is part of an address specification. Thus, the destination plus the destination service access point (DSAP) define the recipient of a packet. The same applies to the source service access point (SSAP). See also DSAP and SSAP.

2) Service Advertisement Protocol

IPX protocol that provides a means of informing network clients, via routers and servers, of available network resources and services. See also IPX.