Examples

DATA     SEGMENT
Variable DW    ?
DATA     ENDS

DGROUP   GROUP DATA, CODE

CODE     SEGMENT
  ASSUME CS:CODE, DS:DGROUP
  MOV    AX, DGROUP:Variable       ; insure Variable is relative to DGROUP
  ASSUME DS:NOTHING
  MOV    BX, CS:Variable           ; access Variable through CS register
CODE     ENDS