SNAX/XF and SNAX/APN Event Management Programming Manual

Glossary
SNAX/XF and SNAX/APN Event Management Programming Manual—426859-001
Glossary-8
Extended Logon Facility (XLF)
Extended Logon Facility (XLF). A feature of SNAX/APN that enables LU-LU sessions
between Compaq applications and remote 3270 devices in an IBM network and between
Compaq applications that emulate 3270 devices and applications in an IBM network.
See also SNAX/APN logon manager (TLOGMGR)
and Tandem Logon Manager for
IBM Systems (ILOGMGR). TLOGMGR and ILOGMGR are the components of XLF.
extensible structure. A structure declared for the value of an extensible structured token.
Extensible structures can be extended by adding new fields to the end of the structure in
later releases. Such structures are typically used to indicate the attributes of an object
being operated on and to return status and statistics information in responses; they can
also be used for other purposes. See also extensible structured token
.
extensible structured token. A token consisting of a token code and a value that is an
extensible structure. The token is referred to by a token map that describes the structure
to SPI so that SPI can provide compatibility between different versions of the structure.
See also simple token
, structured token, token map, and extensible structure.
fault tolerance. The ability of a Compaq NonStop™ system to continue processing despite
the failure of any single software or hardware component within the system.
file name. In the NonStop™ operating system environment, the set of node name, volume
name, subvolume name, and file-identifier characters that uniquely identifies a file. This
name is used to open a file and thereby provide a connection between the opening
process and the file.
file system. In the NonStop™ operating system environment, the application program
interface for communication between a process and a file. A file can be a disk file, a
device other than a disk, or another process.
gateway LU. An LU subordinate to a gateway line on a gateway system. SNAX/XF
transparently handles the passing of information between gateway LUs and the
processes and devices residing on a Compaq system.
gateway PU. A PU subordinate to a gateway line on a gateway system.
gateway system. A Compaq system that has a SNAX communications link to an SNA host.
Guardian environment. The Guardian application program interface (API) and the Compaq
NonStop™ tools. The Guardian API, including the file-system interface, permits user
programs to communicate with the Compaq NonStop™ Kernel.
header. The initial part of an SPI message. The first word of this header always contains the
value -28; the remainder of the header contains descriptive information about the SPI
message, most of which is accessible as header tokens. The tokens in an SPI message
header differ according to the type of message: the header of a message that contains a
command or response differs somewhat from the header of an event message. An
application can use SSGET or EMSGET procedure calls to retrieve the values of header
tokens and can use SSPUT calls to change the values of some header tokens. See also
header token
.