|P is for Practical|
Changing FS/GS register is quite dangerous since you will crash if you call anything in (kernel/user/gdi)32 and FS/GS isn't the TIB *.
You're right! I have spent too long living in the x64 world and am forgetting the details of x86.
On x86 it is the ES: segment register that is 'unused'.
On x64, FS: is 'unused'. (GS: points to the TIB/TEB; and ES: (like CS: DS: & SS:) is 'forced to zero'.)
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