INT 67h,  54h  GET HANDLE DIRECTORY                                  . 4.0

On entry:
        AH = 54h
        AL = subfunction
            00h get handle directory
               ES:DI = pointer to buffer for handle directory
            01h search for named handle
               DS:SI = pointer to 8-byte name
            02h get total number of handles

Return:
        AL = number of entries in handle directory (subfunction 00h)
        DX = value of named handle (subfunction 01h)
        BX = total number of handles (subfunction 02h)
        AH = status
            00h successful
            80h internal error
            81h hardware malfunction
            84h undefined function requested
            8Fh undefined subfunction
            A0h no such handle name
            A1h a handle found had no name