         .586
         .MODEL  flat, stdcall
         OPTION CASEMAP:NONE
         
         .CODE

         EXTERN A:DWORD,B:DWORD,D:DWORD
SumDword PROC   C
         push   EAX
         mov    EAX,A
         add    EAX,B 
         mov    D,EAX
         pop    EAX
         ret    
SumDword ENDP 
         END