Multitasking. Virtual Memory. Tiled window manager. Turns out the very first version of Windows (from 1985) actually has some good points.
Windows 1 got generally negative reviews because of it's poor interface, but underneath the hood it had wizard-level code (much like DESQView/QEMM) and was a big leap forward.
Windows 1 got generally negative reviews because of it's poor interface, but underneath the hood it had wizard-level code (much like DESQView/QEMM) and was a big leap forward.