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It's not DOS, but I really enjoyed reading this explanation of the Windows 95 setup program:

https://devblogs.microsoft.com/oldnewthing/20241112-00/?p=110507

> “So that’s why Windows 95 setup is really three setup programs chained together. It allows a single copy of the code to be used for all three of the installation scenarios. Each program takes you one step closer to the goal. And everything got implemented only once.”