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callback n. 收回 收回 callback n 1: a request by the manufacturer of a defective product to return the product (as for replacement or repair) [synonym: {recall}, {callback}] call-back \call-back\ n. 1. a return call, especially a telephone call. [WordNet 1.5] 2. the recall of an employee to work after a layoff. [WordNet 1.5] 1. 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. 2. 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. 3. (2003-07-13)
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