# Compaq ACMS for OpenVMS
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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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