[datanut]

I’ve worked in environments where USB is 100% disabled, including HID.

Today, I believe but can’t find an affirmative document, that some motherboards have an option to hijack USB HID mouse & keyboards and present them to the OS as something other than USB.

[rasz]

"Legacy USB support" is exactly this, uses SMM/ring -2 software routine to pass data from USB devices into emulated legacy 8042 keyboard & mouse.