A virus is a microscopic organism that can replicate only inside the cells of a host organism. Most viruses are so tiny they are only observable with at least a conventional optical microscope.
Recognized by the Guiness Book of World Records as the MMO with the longest play time per player, and easily the oldest game on this list (launching four years ahead of World of Warcraft, way back in 2001), Runescape deserves mention because it's one of the most updated and popular games of any kind on the planet.
1 Delivered its first PC-based time and attendance product in 1985. 2  Under Mark Ain's leadership, Kronos sustained one of the longest records of growth and profitability as a public company in software industry history â second only to Microsoft. Delivered its first PC-based time and attendance product in 1985. 2  Under Mark Ain's leadership, Kronos sustained one of the longest records of growth and profitability as a public company in software industry history â second only to Microsoft.