prevent users from overwriting other users data
 

Hello all,

I have created a sign up list in excel. Is there a way to protect the
changes a user made to a shared excel file from other users?
I'll explain myself:
I know how to protect a worksheet or a part of it so nobody can modify
it, but I would like to have a file that can't be modified after a
user inserted his name but by the user himself.
So the first user can insert his name in a cell to sign up for a
course and save the file. When the second user opens the file he can't
delete or modify the first users name, only insert his' to,...

I don't know if this is possible.

Any help is appreciated.

Thx