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.
Counter-flashing (or cover flashing, cap flashing) is a term used when there are two parallel pieces of flashing employed together such as on a chimney, where the counter-flashing is built into the chimney and overlaps a replaceable piece of base flashing.