SNAX/APN Application Programming Manual

Glossary
SNAX/APN Application Programming Manual—420111-001
Glossary-10
template LU
template LU. An LU that is added using SCF like standard LUs but is never opened by
applications. A template LU is added for each and every CRT or ITI application that
will be logged onto by devices in the IBM network when the SNAX/APN enhanced
logon facility (ELF) is used. When ELF receives a logon request for a CRT or ITI
application, it uses the information in that application’s template LU to build and
dynamically add an LU for the requested session.
terminal. An I/O device capable of sending and receiving information over communications
lines.
terminal control process (TCP). A process used for terminal management and transaction
control, provided by Tandem as part of the Pathway/TS product. AþTCP is a
multithreaded process that interprets compiled SCREEN COBOL requester programs
(screen programs) in the user’s application, executing the appropriate program
instructions for each I/O device or process the TCP is configured to handle. The TCP
coordinates communication between screen programs and their I/O devices or processes
and, with the help of the PATHMON process, establishes links between screen programs
and server processes. See also requester
and SCREEN COBOL.
TLOGMGR. See SNAX/APN Logon Manager (TLOGMGR)
.
trailer. Control information added to the end of a record.
transmission header (TH). In Systems Network Architecture (SNA), a control field attached
to a basic information unit (BIU) or to a BIU segment and used by path control. It is
created by the sending path control component and interpreted by the receiving path
control component.
two-step read. A method of receiving incoming data by obtaining first the length of the
incoming message and then the data itself, in two separate calls.
waited I/O. Reading and writing activity during which an application process is suspended.
The process does not resume execution until the I/O operations are completed.
WCC. See write control character (WCC)
.
write control character (WCC). A byte found in the outbound data stream.
write structured field (WSF). A 3270 command found in the outbound data stream; it is
followed by one or more structured fields.
WSF. See write structured field (WSF)
.
XLF. See Extended Logon Facility (XLF)
.
$RECEIVE. A special Guardian file name through which a process receives and optionally
replies to messages from other processes by using Guardian procedure calls.