In several areas DOS is still used for stuff that requires no other tasks run simultaneously. This can be used to achieve some kind of near realtime capabilitie

In several areas DOS is still used for stuff that requires no other tasks run simultaneously. This can be used to achieve some kind of near realtime capabilities. E.g. eyetrackers used in psychology studies or tests often still require DOS, because the companies providing these systems don't want to build software that has the same timing capabilities in a newer operating system.