L0:     mov ax,28(bp)      mov di,26(bp)      mov cx,*4 L1:     rcr ax,*1      rcr di,*1      loop L1      mov es,di

ax = high-order word of 32-bit destination di = low-order word of 32-bit destination start extracting click number from dest click number is destination address / 16 it is used in segment register for copy 4 bits of high-order word are used es = destination click