Technical data

run-time library (RTL)
A collection of OpenVMS procedures available to native mode images at run time;
provide support routines for high-level language compilers.
SCALE
A TCP window scaling option; allows window information to be interpreted as
being scaled by 1 to 16 powers of 2, thus increasing the size of the effective window.
secondary server
A master BIND server that receives authoritative database information from a
primary server. Also known as slave server. See also BIND server, cache server,
forwarder server,andprimary server.
segment
A unit of data exchanged by the TCP modules.
segment length
The amount of sequence number space occupied by a segment, including controls
that occupy sequence space.
sequence number
A 32-bit field in the TCP header that contains the sequence number of a sequenced
control flag, the first byte of data, or empty segments (The sequence number of
the next data octet to be sent).
serial device
A device that uses serial transmission; that is, transmits data one bit at a time
on a single channel as opposed to parallel transmission, which transmits one or
more bits at a time on one or more channels. Typically, terminals and printers
are serial devices.
Serial Line Internet Protocol (SLIP)
A protocol designed to allow a host to connect to another host over serial lines, such
as telephone circuits or RS-232 cables.
server
A process that offers a service to another process over the network and accepts
requests from other processes, known as clients.
service
(1) A task that an application can carry out. (2) The interface provided by a service
element or layer for accessing one or more function.
service interface
The boundary at which a layer provides a service to the adjacent higher layer in
the network architecture; may vary between implementations.
service parameter
The means by which a service user and a service provider exchange information.
service provider
In network architecture, the service element or layer that provides a set of services
to the layer immediately above.
service specification
An international standard that describes the functions and service parameters
of every service of a service provider.
service user
An application program, service element, or Network layer that uses the services of
a service provider.
Glossary–41