LU 6.2 API Application Programmer's Reference Guide (30294-90008)

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Glossary
A
Advanced
Program-to-Program
Communication (APPC):
Programmatic communication
based on IBM's LU 6.2
architecture. APPC provides
partner programs with a common
set of rules for communication.
Application Program
Interface (API): A set of
subprograms, callable from inside
applications, that carry out data
communications tasks.
B
basic conversation: A
programmatic conversation in
which the applications must be
able to create and interpret GDS
headers (see GDS header) for
transmitting and receiving data.
basic conversation verbs: the
programmatic implementation of
functions and protocols in a basic
conversation between transaction
programs. (See mapped
conversation verbs.)
C
cluster controller: A machine
that allows multiple devices to
send and receive data over the
same communications link.
communications controller: A
device that controls network data
traffic for the hosts in the
network.
Confirm state: Theconversation
state from which a TP can reply
to a confirmation request and
enter Receive state.
Confirm Deallocate state: The
conversation state from which a
TP can reply to a confirmation
request and enter Deallocate
state.
Confirm Send state: The
conversation state from which a
TP can reply to a confirmation
request and enter Send state.
confirmation request: A
request sent by a TP, asking its
partner TP to confirm the receipt
of data.
control information:
Information exchanged by TPs to
control conversations. Examples
are requests for conversation
allocation and deallocation,
confirmation requests, and error
notifications
conversation: The logical
communication between two
transaction programs.
conversation states: The
conditions of programmatic
conversations under which
certain activities can occur. For
example, if one side of a
conversation is in the condition of
Send state, it can send data, but
it cannot receive data until it
changes to the condition of
Receive state.