I would like to use a DVD burner with USB port. However, those always say that they are laptop writers. Can you connect them to normal PCs and use them normally?
Of course, then you have possibly 2 optical drives s.PC. Possibly. Do you have to install only one driver.
Yes, this is possible, if for the used OS a driver is available.
Yes that works without problems if your PC has USB (which almost all have).
A laptop is a PC, just very mobile.