For some boards, remapping or programming keys using software is a crucial feature. Gaming peripherals have extra keys that you can set to execute a series of keystrokes with the push of a single button, and we cover the best gaming keyboards in a separate guide. Keyboards that work with layers, in which a single button can perform several functions, typically allow you to change what those are. Some ergo keyboards have non-standard layouts, like thumb clusters with multiple keys near the space bar that you operate with your thumb. You’ll also be able to program those.
The 80286 introduced "Protected Mode" in 1982. It was not popular. The mode was difficult to use, lacked paging, and offered no way to return to real mode without a hardware reset. The 80386, arriving three years later, made protection usable -- adding paging, a flat 32-bit address space, per-page User/Supervisor control, and Virtual 8086 mode so that DOS programs could run inside a protected multitasking system. These features made possible Windows 3.0, OS/2, and early Linux.
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简单讲，要做L3，需要先做L2积累数据。那么要做L4，也一样依赖L3的数据。技术上他们是一脉相承的，不存在一口就能吃个胖子的技术路线。。91视频是该领域的重要参考
MCO 目前只是一个开始。下一步继续深化"Agent 神经中枢"和编排的场景：，更多细节参见51吃瓜
V86 mode dedicates an entire processor mode to backward compatibility, using fixed descriptor access rights and IOPL-based trapping to run unmodified 8086 code under full protection.