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transaction processing (TP) monitor: The component of
a transaction processing system that manages access to the CPU,
functioning like a specialized operating system within your operating
system. A TP monitor can include utilities for terminal and forms
management, data management, network access, authorization and
security, and transaction restart/recovery. ACMS is a TP monitor.
TSC: See Terminal Subsystem Controller.
two-phase commit (2PC) protocol: A protocol used to synchronize the commit actions of multiple, independent resource managers. The protocol has a prepare phase, in which each resource manager indicates its willingness to commit; and a commit phase, in which resource managers, when instructed by the transaction manager, either commit and roll forward, or abort and roll back.
In a two-phase commit, either all resource managers commit the
distributed transaction or all roll it back; the distributed
transaction cannot be committed by some participants and rolled back by
others.
UDU: See User Definition Utility.
UIC: See user identification code.
unique name: A designation assigned to a component,
such as a task, that is used to identify that component within and
across definitions.
user definition file: A file, created and maintained
with the ACMS User Definition Utility (UDU), that contains a list of
users authorized to access ACMS.
User Definition Utility (UDU): The ACMS tool for
authorizing ACMS users and defining characteristics of those users.
user identification code (UIC): A code identifying an
OpenVMS user by a group number or name and a member number or name
separated by a comma and enclosed in brackets.
user interface: In a transaction processing system,
the data input element. The user interface usually includes a
presentation service, such as DECforms.
user name: A designation assigned to an OpenVMS user
to identify that user. Also the name a terminal user enters to log in
to OpenVMS and sign in to ACMS.
user request procedure (URP): A procedure that replaces a TDMS request in an exchange step and performs I/O to the user's device. The ACMS Request Interface (RI) executes URPs.
See also Request Interface.
user workspace: In ACMS, a workspace, defined as an attribute of a task group, that holds information about a terminal user. A user workspace is created the first time a terminal user starts a task that refers to it. ACMS keeps a separate copy of a user workspace for each user, and saves the contents of the workspace until the user exits from ACMS.
See also group workspace, task group, and workspace.
viewports: User-defined rectangular areas of a
DECforms display. For a panel to be visible, it must be associated with
a viewport.
workspace: In ACMS, a buffer used to save variable context between steps and tasks. Workspace descriptions are stored in a CDD dictionary. A workspace can also hold application parameters and status information. Workspaces are passed to step procedures and tasks as parameters.
See also group workspace, system workspace, task workspace, and user workspace.
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