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IAC

(1) (InterApplication Communications) The interprocess communications capability in the Mac starting with System 7.0. IAC events take place behind the scenes and enable one application to send a message to another app. See IPC.

(2) (Internet Access Coalition) An earlier consortium of vendors including Microsoft, Intel and IBM, whose mission in the late 1990s was to keep the Internet affordable and promote high-speed access. They opposed regulations that would enable a telephone company to charge a customer more for a data call than a voice call.



IPC

(1) (IP Camera) See network camera.

(2) (InterProcess Communication) The exchange of data between one program and another either within the same computer or over a network. An IPC protocol generally expects a response to a request. Examples are Dynamic Data Exchange in Windows and Interapplication Communications in the Mac (see DDE and IAC).

IPCs are performed automatically by the applications. For example, a spreadsheet program might query a database program to retrieve data. A manual example of an IPC is performed when users copy and paste data from one file to another.

(3) (Instructions Per Clock cycle) The number of instructions that can be executed by a CPU in one tick of the clock. This is accomplished by various pipelining techniques that determine which instructions can be executed in parallel and keeping often-used instructions in a cache. See pipeline processing.



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