The equality/inequality refers to how the columns are used in the query that resulted in the missing index entry.
Generally, if you are going to use the missing index stats DMV to create indexes, you want to create the index with first the equality columns, then the inequality columns and put the columns listed as include columns in the INCLUDE list.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability