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Glossary of Terms
abort
A procedure that terminates a program or session if an irrecoverable error,
mistake, or malfunction occurs, or if the system manager requests
termination.
access
The process of obtaining data from files or acquiring the use of a device.
Access implies an input/output (I/O) operation and is used as a synonym
for I/O.
access codes Access codes are assigned by the system manager to accounts and by the
account manager to groups, and users. Access codes specify which users
have the ability to read, write, append, lock, or execute a given file.
access control definitions (ACDs) An ACD is how the owner of a file defines >who can
do what with the file. ACDs take precedence over other access controls
namely the MPE file access matrix and lockwords. The types of access are
read (R), write (W), append (A), lock (L), execute (X), none (NONE), and
read and copy the ACD permission file (RACD).
access method The way in which data is moved between main storage and input/output
devices.
access port (AP) The MPE/iX system console interfaces the host system through the
access port (AP) located in the channel I/O (CIO) section of the system card
cage. The AP provides a user support interface for issuing hard and soft
resets through software commands from the console. It allows a remote
console to be enabled and to switch between console and session modes.
access rights field (ARF) A field containing the type of memory access. It is compared
with the user's privilege level to determine if the type of access the user is
requesting (READ, WRITE, EXECUTE, or GATEWAY) is allowed for that
page of memory.
account
A collection of users and groups. Each account has a unique name on the
system. It is the method used to organize a system's users and files and
track use of system resources such as central processor time, online
connect time, and file space. Accounts are the principal billing entity for
the use of these resources. Every user must specify an account to access
the system.
account level security The types of file access assigned by the system manager to the
account when it is created. The types of access are READ, LOCK,
APPEND, WRITE, and EXECUTE, abbreviated R, L, A, W, and X
respectively. They may be assigned to any user (ANY), members of the
account only (AC), or members of the group only (GU). The types of file
access permitted are the first level of system security. The account
manager may further restrict groups and users within an account by
assigning them a limited set of file access modes.
account librarian capability (AL capability) A capability assigned by the account
manager to a user within the account. An account librarian can be allowed
special file access to maintain specified files within the account.
account manager capability (AM capability) A capability assigned to one user within
each account who is then responsible for establishing users and groups.
8
Chapter 1
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