> with the 286, you could only go back to real mode by rebooting the PC
No. By resetting the processor which while slow (milliseconds) was sometimes done for this reason. Too slow for context switch but doable occasionally.
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Don't forget LOADALL (which, admittedly, was undocumented outside of Intel's chosen few)
I was not chosen, so i retain my butthurt nature and refuse to acknowledge LOADALL ;)