Can be used to determine which changes have not yet been replicated between two replication partners or track statistics ...

Can be used to determine which changes have not yet been
     replicated between two replication partners or track statistics
     or changes which have replicated between them.

     There are two syntaxes. The first could be used to compare changes 
     made to a directory partition over time. This is a two step process.
     First a reference cookie is created for the partition. Then at a later
     date use the cookie to determine what changes have been
     seen.

     All changed attributes in the partition will be displayed and the 
     cookie updated.


     The second form of the syntax determines what changes have yet to 
     replicate from a given source DC to one or more destination DC's.

     [SYNTAX]
     
     /showchanges .   [/cookie:]
          [/atts:,,...] [/long] [

     /showchanges   
          [/verbose] [/statistics] [/noincremental] [/objectsecurity]
          [/ancestors] [/atts:,,...] [/filter:]

     [EXAMPLES]

     Create a reference cookie for a given partition on a DC

     repadmin /showchanges rootdc01 cn=configuration,dc=contoso,dc=com /cookie:config

     Determine what changes have been made since the cookie was last updated.

     repadmin /showchanges childdc01 cn=configuration,dc=contoso,dc=com /cookie:config

     Determine what changes for the CONTOSO partition have yet to replicate to rootdc01

     repadmin /showchanges rootdc01 2a9e3e32-531f-4c4f-9d95-e2e943aab7e0 dc=contoso,dc=com