API e typewriter: o que têm em comum

1. Passo 1. API — é um tipo de — Software. An interface between programs.
2. Passo 2. Software — inclui — Operating system. A program.
3. Passo 3. Operating system — utiliza — Graphical user interface. The graphical shells of an OS.
4. Passo 4. Graphical user interface — evoluiu de — Linha de comando. The graphical interface replaced the text one.
5. Passo 5. Linha de comando — evoluiu de — Typewriter. The teletype was a printing terminal.

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