protocol processing image (ppi)怎么读

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protocol processing image (ppi)英语什么意思：A software module that is controlled by LES (layered environment services). Several PPIs provide the X.25 and X.29 user interfaces, provide the VAX PSI management functions and trace facilities, and control the handling of virtual circuits.; 一种软件模块,它由分层环境服务程序(LES)管理。几个PPI提供X.25和X.29用户接口,提供VAX PSI管理功能和跟踪功能以及管理虚拟电路的处理。