callback

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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 ?
They, too, had lower callback rates for sales, security, and janitorial occupations than did young applicants, but the pattern was not as stark as it was for the older women.
degree from a selective public university did not generate more callbacks, on average, than a degree from a non-selective public school.
Not all callback solutions are the same, however, nor are all companies that provide such capabilities.
Asia and Eastern Europe are attack hotspots - Looking at the average number of callbacks per company by country, the Asian nations of China, South Korea, India, Japan, and Hong Kong accounted for 24 percent of global callbacks.
The median response time to customer callbacks was four days in our recent survey, the same as in surveys conducted over the previous five years, and 20 percent of the builders said that they respond within two days.
He keeps tabs on callbacks as a line item within each job.
Parameter callbacks - apply to a single parameter; information includes: automatic callbacks, user callbacks, and attributes specifying value limits, grid, and other constraints
In our February survey; two-thirds of the builders who responded said they averaged only one or two callbacks on homes sold during the previous 12 months, and only 10 percent had six or more callbacks per unit.
Determine which callbacks were Right-Party Contacts as opposed to inbound noise;
The median number of callbacks was two, the median cost of response was $200, and the median response time was four days--down from six days in 2000.