Using external source control like Perforce

Hi,

We currently using perforce as source control in Unity.
My question is : What does unity really do when we set the property “Asset Server diff tool” to “P4Merge”
I don’t see any difference with or without p4Merge.

We also tried with svn source control and that’s same.

What’s this property is used for? Oo

Best Regards

without the asset server practically nothing as the “diff this files” functionality is an asset server thing.