A sessioninitiation request generated when an ACF/VTAM application program issues a SIMLOGON macroinstruction.The request specifies a logical unit (LU) with which the application program wants a session and in which the requesting application program will act as the primary logical unit (PLU).; 當IBM的通信系統(tǒng)軟件ACF/VTAM的應用程序發(fā)出宏指令SIMLOGON時所產(chǎn)生的一種啟動話 路的請求,這個請求指定該應用程序打算與其進行一次通話的一個邏輯單元(LU),在這個 LU中的應用程序?qū)⒊洚斨鬟壿媶卧?PLU)。