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)

cost control callback.

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

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"More than 70 percent of tile callbacks come in the first year, when the job is under warranty," Sherman said.

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These designs eliminate jamb rot and reduce callbacks.

Jamb On It

More than half of those still reporting labor shortages say the labor shortage is a factor behind the frequency of callbacks, but fewer companies are now reporting the shortages.

Labor Shortage Lessens

As a result of these production delays, builders report that less than half of all their callbacks are now handled within five days, and the median response time is up to six days, compared with five days in both 1998 and 1999.

Labor Shortages Slow Callback Response

Although labor shortages have extended the start-to-completion time of single-family homes, the time involved in responding to callbacks has not increased.

Quality vs. the labor shortage

The average number of customer callbacks has risen to four per unit, compared with averages of three per unit in a series of surveys NAHB conducted earlier in the 1990s.

Scarce labor hurts service

Problems with plumbing and floors, walls, and ceilings are the most common causes of callbacks. Most callbacks are for the same types of problems that builders reported in our 1990 survey, and they often reflect shortages in skilled labor and glitches in using new technologies.

Minimize callbacks to boost margins

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.

Age discrimination and reform of the U.S. Social Security System

For health jobs that did not require a credential, 8.9 percent of applicants with a public certificate got callbacks, compared with 4.2 percent of those with a for-profit certificate and 5.9 percent for those with no postsecondary degree.

The value of postsecondary credentials in the labor market

Callbacks will take place on Monday, June 16, from 7 to 9 p.m.

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'13 Strategies column, "Cattle Callbacks No More," we asked our readers for tips about improving the casting process.