Get pages for all handles

        Entry:
          AH = 4Dh
          ES:DI = pointer to array to receive information
        Return:
          AH = status
               00h successful
                  BX = number of active EMM handles
                  array filled with 2-word entries, consisting of a handle
                     and the number of pages allocated to that handle
               80h internal error
               81h hardware malfunction
               84h undefined function requested

          Array filled with 2-word entries, consisting of a handle
          and the number of pages allocated to that handle