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Bret Victor's first essay, “Magic Ink” menttioned that there're three types of software on the earth.

• To learn: Information Software
• To create: Manipulation software
• To communicate: Communication software

• Regarding Software Takes Command, Lev Manovichはこんな感じのこと書いてた
  • software: ぜーんぶ
  • application software: the subset of the software
  • media software: the subset of the application software