From MorphOS Library
Break - Allows to send a signal (for eg. CTRL+C) to a process
PROCESS/N, PORT, ALL/S, C/S, D/S, E/S, F/S
PROCESS - number of the process to send a signal to PORT - public port name of the process to send a signal to ALL - sends all signals to the process (see below) C - sends a CTRL+C D - sends a CTRL+D E - sends a CTRL+E F - sends a CTRL+F
Break sets the specified attention flags in the PROCESS indicated. Use the Status command to display the current process numbers. By default, only the Ctrl+C flag is set.
Break acts the same as selecting the relevant process by clicking in its window and pressing the appropriate Ctrl+key combinations.
Ctrl+C is the default for sending a Break signal to halt a process. A process that has been aborted this way displays ***Break in the Shell window. Ctrl+D halts execution of a script file. Ctrl+E closes a process' window. Ctrl+F activates the process' window.