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   REGS             This union, defined in dos.h,stores byte and word_
                    register values to be passed to and returned  from
                    calls to the MSDOS interface functions, int86 etc.


                    Definition:
                       struct WORDREGS
                          {unsigned ax,bx,cx,dx,si,di,cflag,flags; };
                       struct BYTEREGS
                          {unsigned char al,ah,bl,bh,cl,ch,dl,dh; };
                       union REGS
                          { struct WORDREGS x; struct BYTEREGS h; };