Pertaining to a system in which programs are executed in two modes, foreground and background. Foreground programs are executed interactively under user control. Users maintain complete control over editing, execution, inputs, outputs and other program functions. While monitoring the system programs, the microcomputer is said to be in foreground mode. All foreground mode operations are initiated by interrupts. Programs in the background are executed on the basis of time available to the computer system. The microcomputer is often idle 80% of the time, so operators will use it during its idle time for operations wholly unrelated to regular work. All required execution data is setup prior to submitting the job for execution. Users refer to these secondary programs as operating in the background mode. When a job is submitted to the background, user control is usually limited to checking program status (running, waiting, printing, etc.) or aborting the job.; 與以前臺和后臺兩種方式執(zhí)行程序的系統(tǒng)相關(guān)。前臺程序在用戶控制下交互執(zhí)行,用戶對 編輯、執(zhí)行、輸入、輸出以及其它程序功能維持完全控制。在監(jiān)視系統(tǒng)程序期間,微計(jì)算機(jī) 被說成是處于前臺方式,所有前臺方式的操作都由中斷發(fā)起。后臺中的程序根據(jù)可用于計(jì)算 機(jī)系統(tǒng)的時間來執(zhí)行。微計(jì)算機(jī)常常80%的時間為空閑,因此,操作員在空閑時間用它完成與 主要工作無關(guān)的操作,所有要求執(zhí)行的數(shù)據(jù)都在提交要執(zhí)行的作業(yè)之前建立,用戶調(diào)用這些次 要程序以后臺方式操作。當(dāng)作業(yè)提交給后臺時,用戶控制通常限于檢查程序狀態(tài)(運(yùn)行、等 待、打印等)或放棄該作業(yè)。