Fetches a page from the current storage area. If you specify a
    valid page number, that page is fetched from the current storage
    area. If you enter the PAGE command without a page number, the
    next page in the current storage area is fetched. If you enter
    the PAGE command without a page number and you are already at the
    highest numbered page of the storage area, page 1 of the storage
    area is fetched.