The thing is that I have an Excel file with 4 sheets in it.
I want 2 person one after the other to work on the very same file on the
same PC. I want the first one to be able to work on the 4 sheets of the file
and the second to be able to work and see only the two first sheets of the
very same file in the same PC...but not the 2 others which I would like to
protect 'alone' with a password.

How can this be done?

Thank you so much for your help