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In information technology, header refers to supplemental data placed at the beginning of a block of data being stored or transmitted. In data transmission, the data following the header is sometimes called the payload or body.
The first forms of online advertising targeting came with the implementation of the personal email message. The implementation of the internet in the 1990s had created a new advertising medium; until marketers realized that the internet was a multibillion-dollar industry, most advertising was limited or illicit.
It has been estimated that there may have been as many as 8,000 friendly fire incidents in the Vietnam War; one was the inspiration for the book and film Friendly Fire.. 2 January 1966, in Bao Trai in the Mekong Delta during joint Australian/American forces fighting the Viet Cong, a USAF Cessna O-1 Bird Dog flying at low level accidentally flew through Australian and New Zealand artillery fire.