command control block(CCB)

In VSE, a 16-byte field required for each channel program executed by physicalinput／output control systems(IOCS). This field is used for communication between physical IOCS and the problem program.; 在操作系统VSE中,由物理输入输出控制系统(IOCS)所执行的每个通道程序所要求的一个16字节域。该域用于物理IOCS和问题程序之间的通信。