SNAX/APN Application Programming Manual

Glossary
SNAX/APN Application Programming Manual—420111-001
Glossary-3
character-coded logon
character-coded logon. A logon request encoded and transmitted as a character string; The
format indicator in the request header (RH) for the request is set to zero. Synonymous
with unformatted request. Contrast with field-formatted request.
character set. A defined collection of character representations valid for a particular
program, printer, or language. Characters may be stored in ASCII or EBCDIC, and may
be displayed on screen or printed in a variety of languages. In SNAX/APN, characters
must be stored in EBCDIC.
checkpoint. On a Tandem NonStop system, a snapshot of process activity that can be used in
the event of a takeover to allow a backup process to maintain fault-tolerant operation.
CINIT. An SNA control initiate request.
condition code (CC). A mechanism within the Tandem NonStop system that indicates, upon
completion of each file-system procedure call, whether or not the call was completed
successfully. There are three condition code states: condition code less than (CCL or <),
condition code equal (CCE or =), and condition code greater than (CCG or >).
condition code equal (CCE). A condition code returned by a file-system procedure,
indicating that the operation was successful. See also condition code (CC)
.
condition code greater than (CCG). A condition code returned by a file-system procedure,
indicating a warning; it is not used in SNAX/APN.
condition code less than (CCL). A condition code returned by a file-system procedure,
indicating that an error has occurred. See also condition code (CC)
.
CONTROL-Y command. The end-of-file (EOF) command.
conversational mode. A terminal operating mode in which data is read from the terminal and
displayed on the terminal screen one line at a time. See also block mode
.
CRT interface. The application program interface selected when using the CRT protocol.
See also CRT protocol
.
CRT protocol. A high-level 3270 protocol that supports block-mode communications with
display terminals and printers. The CRT protocol allows the calling process to
communicate with a device as if the device were an ordinary file.
dependent LU. Any LU that doesn’t support LU6.2 protocols. Dependent LUs require the
services of a System Services Control Point (SSCP) and they are controlled by an
SSCP_LU session. Type 6.2 LUs do not require the services of an SSCP and these are
called independent LUs.
device. An addressable I/O unit, independent of its physical environment (for example, a
terminal or printer).