In AS／400, the operating system support that allows an AS／400 system to appear as a 3274 Control Unit in a BSC multipoint network or an SNA network.; 在AS／400系統(tǒng)中,操作系統(tǒng)OS／400的支持程序,使AS／400系統(tǒng)在BSC多點(diǎn)網(wǎng)絡(luò)或 SNA網(wǎng)絡(luò)中充當(dāng)3274控制器的作用。