Stops (suspends) process 1721 by sending the STOP signal to the process. This process will still be on the task list. The process can't catch or ignore the STOP signal.
  kill -STOP 1721
Continue process 1721 causing it to resume. The CONT signal is sent to the process.
  kill -CONT 1721

Terminates process 1721 by sending the TERM signal to the process. This process will no longer show up on the task list if it is actually terminated. Process terminated cannot be continued. The TERM signal can be caught so TERM is not guaranteed to kill the process.
  kill -TERM 1721		

Stops, then restarts process 1721. This is usually done when a process is not working properly or the configuration files for that process have been changed. This command sends the HUP signal to the process which means hangup. This signal can be caught by the process.
  kill -HUP 1721		

Restarts any process with the name "myprint".
  killall -HUP myprint

Terminates any process with the name "myprint".
  kill -TERM myprint