I have a question: Can you buy a computer (PC) and then connect it to a laptop and the laptop is then the monitor, and if so, what do you need for it?
Look here
Lappis usually have no monitor input, only one output for monitor, TV… So no
One idea: use TeamViewer or AnyDesk, then tap the screen content from your laptop.
But I say the same: Meaningful but that should not be alone because of the time delay. :-P