Wht doe chain unchain means

hi
i want to know the below statment meaning?
if i give three fields and if i give only fiest field ship_to in chain unchain what diference it makes?  
CHAIN.
      FIELD t_ZCUST_EM_create-ship_to .
      FIELD t_ZCUST_EM_create-ship_to_name .  "nv
      FIELD t_ZCUST_EM_create-email_id .  "nv
     MODULE set_field_validation ON CHAIN-REQUEST.
    ENDCHAIN.
   MODULE USER_COMMAND_0200.   "nv
regards
Arora

Check below link
http://help.sap.com/saphelp_nw04/helpdata/en/9f/dbabbd35c111d1829f0000e829fbfe/content.htm
Regards,
Atish

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