APPC Subsystem on MPE/XL Node Manager's Guide (30294-90007)

247
remotely controlled session:
An APPC session controlled by an
LU on the remote system. Also
called a bidder session. The APPC
subsystem does not support
remotely controlled sessions. See
locally controlled session.
RH: Request or response header.
These are attached to SNA RUs
to control data flow and support
other network services.
RU: Request or response unit.
S
SDLC: See Synchronous Data
Link Control.
SNA: See Systems Network
Architecture.
SNA/SDLC Link/XL: A bundled
HP hardware and software
product that provides the logical
and physical connection between
the HP 3000 and an IBM host.
SNA/SDLC Link/XL is used in
combination with an SNA
Service, such as SNA IMF, SNA
NRJE, or LU 6.2 API.
SSCP: System Services Control
Point. An SSCP manages nodes
within its domain and stores
status information for personnel
to maintain a network. It exists
only in Type 5 nodes,
implemented by the
communications access method.
Synchronous Data Link
Control: The data link level
communications protocol used in
SNA.
Systems Network
Architecture (SNA): A
comprehensive specification for
distributed data processing
developed by IBM. SNA defines a
layered protocol for
communicating and controlling a
communications network within
the IBM environment.
T
transaction program (TP): An
application program that
processes distributed
transactions.
transmission header (TH): The
portion of an SNA data packet
that contains routing and
sequencing information.
V
verbs: The programmatic
implementation of functions and
protocols in a conversation
between transaction programs.
Virtual Telecommunications
Access Method (VTAM): The
SNA program on the host that
controls the resources of a domain
in an SNA network.