The process of defining a network to VTAM and altering IBMdefined VTAM characteristics to suit the installation. VTAM definition is implemented by an installation with definition statements and macroinstructions stored in a special data set or file.; 向VTAM定義網(wǎng)絡(luò)和修改IBM定義的VTAM特性以適合設(shè)備需要的過(guò)程。VTAM定義是通過(guò)安裝儲(chǔ)存在特定的數(shù)據(jù)集或文件中的定義語(yǔ)句或宏指令來(lái)實(shí)現(xiàn)的。