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Glossary
OSI/FTAM Responder Manual—425199-001
Glossary-2
(Application Layer) to manipulate files on remote computer systems. For Compaq
FTAM, applications can be written in C or TAL.
application entity. The part of an application process that interacts with its peer entity
in a remote application process. In an OSI application, the application entity is the part
that represents the communication functionality necessary for interoperation.
application entity title (AE title). The structured identifier that identifies an application
entity to the OSI network. The AE title is passed as a parameter in the ACSE
A-ASSOCIATE request and returned in the A-ASSOCIATE response. See application
entity.
Application Layer. Layer 7 of the OSI Reference Model. This layer provides the
interface between user programs (application processes) and the OSI network. Layer 7
includes the standards for services such as file transfer, electronic mail, and terminal
access.
Application Manager. See APLMGR.
application name. The Compaq OSI/AS term for a reference name used to look up an
OSI address in the local OSI/AS management information base (MIB). In Compaq
FTAM terminology, this name is called the common name. See common name.
application program interface (API). The set of functions or procedures that permits
user programs to communicate with the Compaq NonStop Kernel. For Compaq FTAM,
the API consists of FTM, APS, and MFM procedures used in FTAM programming. The
Compaq FTAM API also includes the data definitions provided in the ZFTMDDL file
and all language-specific files derived from ZFTMDDL. See also APS procedures,
FTM procedures, and MFM procedures.
application service element. See ASE.
APS (application, presentation, and session) procedures. A set of procedure calls,
provided by Compaq as part of the OSI/AS subsystem, providing application programs
with access to the services of ACSE (in the Application Layer), the Presentation Layer,
and the Session Layer. The names of the APS procedures all begin with the letters APS.
The APS procedures are defined in the EXTDECS0 and CEXTDECS files. The APS
procedures, together with the definitions in the ZAPSDDL file, constitute the OSI/AS
API. A subset of the APS procedures is accessible from, and must be used with, the
FTAM API. See also API.
arc. A directed link between two nodes in a hierarchical file.
arc length. The number of node levels in a file hierarchy from the root node to a given
node. For example, the arc length of an FTAM-2 document is always 1.
ASE (application service element). A set of functions to be performed—such as file
transfer, mail service, or transaction processing—along with all the elements necessary
to perform that kind of work, to support a particular application.
ASI (additional service information). An internal data format used by Compaq FTAM.
ASI format is displayed in some of the USER and ASN1 trace records. The Compaq
initiator and responder processes transform ASI into the transfer syntax negotiated for
the association, and vice versa.