How will the query improve performance when we use hint index_ss

hi,
I got a SQLquery from our Reports team. initially when I ran the query it took long time and I tuned the query using SQL TOAD optimizer ..I ran the tuned query and it fetched the rows faster than the last one. I observed that a new Hint was added to that query. Index_ss+ > can some explain me how this index_ss increase the performance with an example

As always the online documentation (at http://tahiti.oracle.com) comes with the answer.
Sadly you need an extra pair of voluntary fingers to search and read it.
http://download.oracle.com/docs/cd/E11882_01/server.112/e17118/sql_elements006.htm#SQLRF50415
Sybrand Bakker
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select distinct com.m1co as CO_ID,
fsr.policy_number as POL_ID,
com.M1AGNM as AGNCY_ID,
cr.agent_code as AGT_ID,
P.full_name as agent_name,
ia.status_description as STS_CD,
to_char(ia.bound_date, 'MM/DD/YYYY') as POL_INFC_DT,
(fchgmm||'/'||fchgdd||'/'||fchgyy) as PAY_UP_DT ,
(mcpdtm||'/'||mcpdtd||'/'||mcpdty) as pay_to_dt,
(fexpmm||'/'||fexpdd||'/'||fexpyy) as MATURE_DT,
ia.BILLING_FREQUENCY as PAY_MODE_CD,
casc.MCPYCD as PAY_METHOD_CD,
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SELECT DISTINCT com.m1co                             AS CO_ID,
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                com.m1agnm                           AS AGNCY_ID,
                cr.agent_code                        AS AGT_ID,
                ' '                                  AS AGNCY_ID_2,
                ' '                                  AS AGT_ID_2,
                ' '                                  AS AGT_ID_2_NAME,
                P.full_name                          AS agent_name,
                ia.status_description                AS STS_CD,
                To_char(ia.bound_date, 'MM/DD/YYYY') AS POL_INFC_DT,
                ( fchgmm
                  ||'/'
                  ||fchgdd
                  ||'/'
                  ||fchgyy )                         AS PAY_UP_DT,
                ( mcpdtm
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                  ||mcpdtd
                  ||'/'
                  ||mcpdty )                         AS pay_to_dt,
                ( fexpmm
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                  ||fexpdd
                  ||'/'
                  ||fexpyy )                         AS MATURE_DT,
                ia.billing_frequency                 AS PAY_MODE_CD,
                casc.mcpycd                          AS PAY_METHOD_CD,
                casc.mcprmm                          AS MODAL_PREM_AMT,
                casc.mccrcd                          AS POL_CUR,
                casc.mcnopt                          AS NFO_CD,
                cas.finstp                           AS LINE_OF_BUSS,
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                ' '                                  AS POLICY_LAPSED_DT,
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