MS-DOS could only run one application simultaneously Windows 386 allowed DOS apps to run in the background instead of suspended, although timing-sensitive apps had issues. This allowed it to have a limited form of preemptive multitasking, which was a significant technological improvement for PC OSes. The 386 version allowed it to run in protected mode, above which applications and the GUI ran as a virtual task in the 8086 instruction set. Windows 2.10 came in two different flavors, one for the Intel 80286 16-bit processor and the other for the Intel 80386 32-bit processor.
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