On: macOS Monterey

[MrWiffles]

Could you tell us what MST stands for? I doubt you mean “mountain standard time” :-)

[endisneigh → MrWiffles]

Multi-stream transport.

If you have a dock with say, HDMI and DisplayPort and have both plugged in, with a mac you can't use a single dock for multiple displays in this way. You'd have to use DisplayLink.