The crossword solution for the term FOLLOWER DOS is TRES, which is a four-letter word. TRES is a Spanish word meaning 'THREE' and is often used in the context of counting or enumerating items. In this case, it is being used to refer to a follower of DOS, which is the Spanish word for 'TWO'. DOS is also the name of an operating system developed by Microsoft in the 1980s. Therefore, TRES can be interpreted as referring to a follower of DOS, or a computer system that is based on the DOS operating system.