callback


Also found in: Dictionary, Thesaurus, Idioms, Wikipedia.

callback

(programming)
A scheme used in event-driven programs where the program registers a subroutine (a "callback handler") to handle a certain event. The program does not call the handler directly but when the event occurs, the run-time system calls the handler, usually passing it arguments to describe the event.

callback

(communications, security)
A user authentication scheme used by some computers running dial-up services. The user dials in to the computer and gives his user name and password. The computer then hangs up the connection and uses an auto-dial modem to call back to the user's registered telephone number. Thus, if an unauthorised person discovers a user's password, the callback will go, not to him, but to the owner of that login who will then know that his account is under attack.

However, some PABXs can be fooled into thinking that the caller has hung up by sending them a dial tone. When the computer tries to call out on the same line it is not actually dialing through to the authorised user but is still connected to the original caller.

callback

(communications)

callback

An authentication technique that calls the sender back. After connection is made, the receiving side breaks the connection and calls the sender to ensure that the logon was made from the authorized computer. Callback prevents a stolen ID and password from being used on a different machine. See also Web callback.
References in periodicals archive ?
Since the converter has three network modes, the converter needs three different groups of callback functions.
Due to the impending holidays, its call wait times were long and she too agreed to receive a callback. She had no speech recognition barriers; she was quite happy with the offered callback service and had full confidence it would work.
Roamers CallBack solution allows subscribers, who are traveling outside the coverage area of their mobile operator, to place calls to their home network at cheaper rates avoiding costly roaming and interconnection charges.
The rate of callbacks depended on the type of job being offered.
The majority of APT callback activities are associated with APT tools that are made in China or that originated from Chinese hacker groups.
malware families against callbacks, FireEye discovered that the majority of APT
Tenovus Cancer Callback service will offer newly diagnosed patients across South Wales a series of regular calls from an experienced nurse.
WHILE we are all shocked at Cheryl Cole's decision not to include Gamu Nhengu in her three choices i think we were even more shocked at the fact that she did not even get a wildcard callback.
From these initial auditions, the lucky finalists will make it through to callback, where they will be put through their paces by renowned choreographer Lee Alexander, who has performed with the likes of Girls Aloud and Leona Lewis.
In order to increase the data available on asthma, the Centers for Disease Control and Prevention (CDC) converted the National Asthma Survey to a callback survey administered nationally as part of BRFSS in 2005.
Jonathan Flom, Get the Callback. The Art of Auditioning for Musical Theatre.