def do_break(self, arg):
        """
        break - force a debug break in all debugees
        break <process> [process...] - force a debug break
        """
        debug   = self.debug
        system  = debug.system
        targets = self.input_process_list( self.split_tokens(arg) )
        if not targets:
            targets = debug.get_debugee_pids()
            targets.sort()
        if self.lastEvent:
            current = self.lastEvent.get_pid()
        else:
            current = None
        for pid in targets:
            if pid != current and debug.is_debugee(pid):
                process = system.get_process(pid)
                try:
                    process.debug_break()
                except WindowsError:
                    print("Can't force a debug break on process (%d)")
break - force a debug break in all debugees
        break <process> [process...] - force a debug break