active DBMS


A conventional or passive DBMS combined with a means of event detection and condition monitoring. Event handling is often rule-based, as with an expert system.

Last updated: 1994-11-08

Active Directory

<operating system>

A directory service from Microsoft Corporation, similar in concept to Novell Netware Directory Services, that also integrates with the user organisation's DNS structure and is interoperable with LDAP. Active Directory is included in Windows 2000.

Last updated: 2000-03-28

Active Language I

<tool, mathematics>

An early interactive mathematics system for the XDS 930 at the University of California at Berkeley.

["Active Language I", R. de Vogelaere in Interactive Systems for Experimental Applied Mathematics, A-P 1968].

Last updated: 1994-11-08

active matrix display


A type of liquid crystal display where each display element (each pixel) includes an active component such as a transistor to maintain its state between scans.

Contrast passive matrix display.

Last updated: 1995-12-09

Active Measurement Project

<networking, tool, project>

(AMP) An NLANR project undertaking site-to-site measurement across the HPC networks. This work is intended to compliment the measurements taken by MCI and Abilene within the networks' infrastructure. Currently round trip times, topology, and packet loss are being measured.

Last updated: 2004-01-18

Active Monitor


A process in an IBM token ring network which ensures a token is present on the ring, removes circulating frames with unknown or invalid destinations, and performs introductions between machines on the ring.

Last updated: 1996-06-18

active object


An object each instance of which has its own thread running as well as its own copies of the object's instance variables.

Last updated: 1998-03-08

Active Reconfiguring Message


(ARM) An efficient mechanism which allows reconfiguration of the hardware logic of a system according to the particular data received or transmitted.

In ARM each message contains extra information in a Reconfiguring Header in addition to the data to be transferred. Upon arrival of the message the Reconfiguring Header is extracted, decoded and used to perform on-the-fly hardware reconfiguration. As soon as the hardware has been reconfigured the data information of the message can be processed.

[In what contect is this term used?]

Last updated: 1997-06-06

active record pattern


Martin Fowler's name for object relational mapping viewed as a software architecture pattern.

Last updated: 2014-12-03

Active Server Pages

<web, programming>

(ASP) A scripting environment for Microsoft Internet Information Server in which you can combine HTML, scripts and reusable ActiveX server components to create dynamic web pages.

IIS 4.0 includes scripting engines for Microsoft Visual Basic Scripting Edition (VBScript) and Microsoft JScript. ActiveX scripting engines for Perl and REXX are available through third-party developers.


Last updated: 1999-12-02



A type of COM component that can self-register, also known as an "ActiveX control". All COM objects implement the "IUnknown" interface but an ActiveX control usually also implements some of the standard interfaces for embedding, user interface, methods, properties, events, and persistence.

ActiveX controls were originally called "OLE Controls", and were required to provide all of these interfaces but that requirement was dropped, and the name changed, to make ActiveX controls lean enough to be downloaded as part of a web page.

Because ActiveX components can support the OLE embedding interfaces, they can be included in web pages. Because they are COM objects, they can be used from languages such as Visual Basic, Visual C++, Java, VBScript.

["Understanding ActiveX and OLE", David Chappell, MS Press, 1996].

Last updated: 2002-04-19

ActiveX Data Objects

<database, Microsoft, programming>

(ADO) Microsoft's library for accessing data sources through OLE DB. Typically it is used to query or modify data stored in a relational database.


Last updated: 2003-07-08

Nearby terms:

activation recordactive DBMSActive DirectoryActive Language I

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