4k a.k.a. Askari Aviation is based in Rawalpindi, Punjab, Pakistan. Askari Aviation was established in 1995, to maintain, operate and market aircraft and helicopters.
- 4K a.k.a. Cuatro Cabezas is an Argentine production company that specializes in content for television, radio and motion picture production, advertising, and Internet content. It was founded in 1993 by owners and founders, Diego Guebel and Mario Pergolini. The company also operates in Chile, Brazil, Spain and Italy.
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- 4K is a computer virus which infects COM files and EXE files. The virus was one of the first to employ stealth tactics. Infected systems will hang, after September 22 every year, which is also the date of birth Bilbo Baggins, a character from the The Lord of the Rings. The code was intended to display the message Frodo Lives, but hangs in all known variants.
- 4K a.k.a. The Laser 4000 is a well known racing dinghy crewed by two persons. Its one-design weight-equalised system enables physically differing sailors to compete on a level playing field. It is most popular in Europe, particularly the UK, France and Italy.
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