SET CONTROL is a DCL command that enables or disables the Ctrl/Y or the Ctrl/T function. Pressing Ctrl/Y interrupts a command and returns you to the DCL command level. Pressing Ctrl/T momentarily interrupts a command to print a line of statistics. SET CONTROL=T requires that SET TERMINAL/BROADCAST be set for the information to be displayed at your terminal.
SET CONTROL [=(T,Y)] SET NOCONTROL [=(T,Y)]