Steve Jobs originally unveiled Keynote, Apple's presentation software (now costs Â£79 in the iWork bundle with its page layout program Pages and spreadsheet Numbers) back in January 2003, after beta-testing it in secret in public for a year.
Flashes (medical symptom): Flashes are visual effects where a person sees sudden flashes of light. (For flashes of warm feelings see hot flashes.) Some of the effects are like flashing lights, an arc of light, or the feeling like a light-bulb has just flashed on and off in the periphery of vision.
To flicker is to flash on and off at random. If your computer screen is flickering right now, you are probably having trouble reading this. Something that is flickering is flashing on and off in an unpredictable way. A fluorescent light may flicker for a while before it stops working. A flicker is also a quick flash or burst of light, like a glint or a spark. Similarly, flicker can refer to a sudden and short-lived feeling. A child opening a present might have a flicker of excitement before realizing that the box contains only tube socks and underwear.