How was applications programmed for early windows, did they conform to a standard what language is the windows framework developed in. Did they have to license developing software to make a windows application?
You bought the Windows Software Development Kit (SDK) and applications were written in C. But the API functions used the Pascal calling convention, I don't remember why. Here is a relatively recent talk about looking back at Windows 1.0: http://www.charlespetzold.com/etc/Windows1/index.html