When you log in, you can have it send a code to your cell phone by text message as further security.
Inhabitants can then request that lights be turned back on as needed by sending a code to a special phone number called Dial4light.
Google sends a code to your phone, which you use to complete the registration.
Also, you'll know if someone is trying to log on as you because your phone will send you a code that you're not expecting.
Applications with the Flurry software built in also send a unique code identifying what kind of device they are running on.
Giving vent to his frustration he sent a code to the platoon to open fire with grenades.
After an office visit, a physician sends a diagnostic code to the insurer, which then decides the level of payment.
Some companies scramble the signal to thwart those who might try to send a spurious code and defeat the system.
A regular AT keyboard sends a different code for key down and key up.
That means they sent a code of 32 impulses.