What is referred to by 'carriage platen shift key'?

Based on the clue 'carpoolers traversing this washington city via hig...', what is the answer? What is referred to by 'carrantuohill in macgillycuddys reeks'? Based on the clue 'carrara is an italian type of this material popula...', what is the answer? Based on the clue 'carrara italy is famous for its quarries of this r...', what is the answer? Based on the clue 'carriage clocks had these on top because they were...', what is the answer? What is referred to by 'carriage for a cucaracha'? Based on the clue 'carrie mr big took a romantic carriage ride in ce...', what is the answer? What is associated with: carrie 1974?