The answer is essentially hardware-level dependency injection. Before calling LD_DESCRIPTOR, the caller saves its desired test constant into a hardware latch using a micro-op called PTSAV (Protection Save). Within LD_DESCRIPTOR, another micro-op called PTOVRR (Protection Override) retrieves and fires the saved test.
My base layout is very close to Halmak. I modified a couple of characters in the center columns to better align frequency with ease of reach on a columnar layout. I use home row mods for my home keys, and all of my thumb keys are dual-function keys with layer switching hold actions.，这一点在爱思助手下载最新版本中也有详细论述
Why hide such a handsome piece of handiwork?。搜狗输入法下载对此有专业解读
Владислав Уткин