Understanding Microsoft Code For Index Performance...

Hello,

I found this code in a Microsoft document about index perfromance in SQL 2005. Can some one explain what iss returned by this statement, in relation to what I should do with this data to create/improve indexes? I am not sure based on the results what the columns mean as far as what needs to be done to indexes. What is the equality_columns, included_columns, statement, etc information? Do I make an index for the included_columns? Any help would be appreciated.

Here is the code:
-- Potentially Useful Indexes
select d.*
, s.avg_total_user_cost
, s.avg_user_impact
, s.last_user_seek
,s.unique_compiles
from sys.dm_db_missing_index_group_stats s
,sys.dm_db_missing_index_groups g
,sys.dm_db_missing_index_details d
where s.group_handle = g.index_group_handle
and d.index_handle = g.index_handle
order by s.avg_user_impact desc
go
--- suggested index columns and usage
declare @handle int

select @handle = d.index_handle
from sys.dm_db_missing_index_group_stats s
,sys.dm_db_missing_index_groups g
,sys.dm_db_missing_index_details d
where s.group_handle = g.index_group_handle
and d.index_handle = g.index_handle

select *
from sys.dm_db_missing_index_columns(@handle)
order by column_id