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You can unwittingly install such programs quite easily , often by clicking on an attachment in an infected email message , downloading software from some untrustworthy website , installing software from an unreliable source ( including ' bootleg ' software ) , etc. Our proposed approach to the integration of design rationale and formal specification requires two additional forms of support if it is to be successfully used by ` real-world ' engineers on the development of ` real-world ' software . The very name ' software ' was chosen by the computer industry to emphasize that a computer program is only an extension of the computer ' hardware .