From Windows server, it's not that simple to checkDFSreplication state. I don't think we can see it from a graphical window. So after some researches I found that we can have some informations from the command line.
/SMem : The DNS name of the sender.
/RMem : The DNS name of the receiver.
/RGName : Replication group name.
/RFName : Replication folder name.
To make it clearer, the correspondence between the dfs manager and the options :
Know number of files to replicate from SRV01 to SRV02