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Human interface device or HID is a type of computer device usually used by humans that takes input from humans and gives output to humans.
The term "HID" most commonly refers to the USB-HID specification.
High-level emulation (HLE) and low-level emulation (LLE) refer to methods used when emulating components or entire systems.
They're used to differentiate approaches to system implementations by how each emulator handles a given component; a high-level emulator abstract the component with the goal of improving performance on the host, sacrificing the thorough measures needed to guarantee the correct behavior. The simplicity of most consoles allow low-level emulation to be feasible.
workflows of yuzu
yuzu and yuzu_cmd are two threads on program start. yuzu dedicates for ui while yuzu_cmd loads files and does emulation. yuzu_cmd is the Application entry point.

yuzu_cmd startup

Initiates logger
Parses arguments
Applys settings
Determins renderer backend between OpenGL and Vulkan
Set File system
Load ROM and create GPU
function signature in core.cpp: SystemResultStatus Load(System& system, Frontend::EmuWindow& emu_window, const std::string& filepath, u64 program_id, std:size_t program_index))
Start GPU
Register exit callback
(Optional) Enable Debugger
Wait for emulator window event
(Stop) Detach debugger
(Stop) Pause
(Stop) Shutdown
(Stop) Wait all detached tasks

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