Even though all CPUs since the 80286 were capable of running in
Protected mode, MS-DOS ran the CPU in Real mode. This was done to preserve
backward-compatibility with the old 8086 and 8088 CPUs.
Use the Linux User Interface 19
In Protected mode, the CPU can run multiple virtual 8086 emulation sessions at
the same time. In Real mode, the CPU emulates a fast 8086, which only allows one
session to run at a time.
Unlike DOS, Linux is fully capable of running an x86 CPU in Real mode, which
allows it to run multiple command-line sessions at once. Each session can run its
own programs, all simultaneously. This can be very useful if you have one program
running and then need access to the command prompt. Simply press
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