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Alcon, or RSY (which is more or less as commonly used of a name as Alcon), is a computer virus that was discovered to be spreading in Europe in 1997. It is a boot virus.

Common name Alcon
Technical name Alcon
Aliases RSY, Kendesm, Ken&Desmond, Ether,DOS/Alcon
Family N/A
Classification Virus
Type DOS
Subtype Boot virus
Isolation 1997
Point of isolation Europe
Point of Origin Unknown
Author(s) Unknown