Selection of all objects with same material?

Can I select all objects with same material ?

Or can I replace one material with another for all its users.

(I don’t want to modify it - which would change the appearance of all users - because I have already made the material elsewhere and it would be tedious to repeat all the settings)

-Christos

Select all the objects you want to assign the material to, then select the object that has the material applied to it, and then ctrl+L and select materials. This will give all objects selected the same material as the last one selected.

Thank you,
and what happens if the material to be applied is in a slot for the user? being one of 3-4 materials found on diferent faces of the object ?