To manually stop programs that are running, issue a keyboard interrupt by typing Ctrl+C (UNIX) or Ctrl+Break (Windows). A message indicating the statement number and program unit being executed is issued on the terminal or IDL Command Log acknowledging the interrupt. The values of variables can be examined, statements can be entered from the keyboard, and variables can be changed. The program can be resumed by issuing the .CONTINUE executive command to resume or the .STEP executive command to execute the next statement and stop.