1. In SNA, a message unit that contains control information such as a request code, or function management (FM) headers, enduser data, or both.; 系統(tǒng)網(wǎng)絡(luò)體系結(jié)構(gòu)(SNA)中的一種報(bào)文單位，它包含諸如請(qǐng)求代碼或操作管理(FM)首標(biāo)、最終用戶數(shù)據(jù)等控制 信息。同request。 2. In DPCX, the smallest unit of data or control information that is sent to or received from a processor via a data link. | 在DPCX系統(tǒng)中，處理機(jī)通過(guò)數(shù)據(jù)鏈路發(fā)送或接收數(shù)據(jù)或控制信息的最小單元。