IPX/SPX Programming Manual

HP NonStop IPX/SPX Programming Manual—528022-001
Glossary-1
Glossary
The following glossary defines terms used both in this manual and in other NonStop
TCP/IP and IPX/SPX manuals. Both industry-standard terms and HP terms are
included; HP terms are marked as such. Because this is a glossary for HP NonStop
IPX/SPX as a whole, not all terms listed here are used in this particular manual.
Access Control Server (ACS). An optional HP system process that can be used to grant or
deny workstation access to the RSC services on the HP system. Users must create
their own RSC ACS.
action event. An event that requires operator intervention to resolve. Each subsystem
determines which events are action events by including a unique EMS token in the
event message. Action events are reported as pairs of event messages: an
action-attention message to report the problem and an action-completion message to
report the problem resolution.
adapter card. A printed circuit card that provides the interface between a workstation and
the LAN.
address mask. A bit mask used to select bits from an Internet address for subnet
addressing. The mask is 32 bits long and selects the network portion of the Internet
address and one or more bits from the local portion.
Address Resolution Protocol. See ARP.
address resolution. Conversion of an Internet address into a corresponding physical
address. Depending on the underlying network, resolution might require broadcasting
on a local network. See also ARP (Address Resolution Protocol).
API. See application program interface (API).
application program interface (API). A general term for a software interface that allows
an application program to talk to or control another service-providing program so that
the application program can use the services provided. For example, an application
program in the form of a “client” might use an API to talk to a server program.
ARP (Address Resolution Protocol). The Internet protocol used to bind dynamically a
high-level Internet Address to a low-level physical hardware address. ARP applies only
across a single physical network and is limited to networks that support hardware
broadcast.
ARPA (Advanced Projects Research Agency). See DARPA (Defense Advanced Projects
Research Agency).
ARPANET. A pioneering long haul network funded by ARPA (later DARPA) and built by
Bolt, Baranek, and Newman (BBN). It served as the basis for early networking
research as well as a central backbone during the development of the Internet.