In TSO, the environment in which jobs submitted through the SUBMIT command or SYSIN are executed. One job step at a time is assigned to a region of main storage, and remains in main storage to completion.

• 在分时系统(如IBM的TSO)中,指在其中可以执行“通过命令submit(递交)或逻辑设备SYSIN而递交的”作业的环境。每执行一个作业步,就要分配一定区域的主存(空间),直到作业完成后才释放这部分的主存储区。