How to put an object on the upper panel, for all the users

In my user I create an object for the upper panel with dconf-editor, I modified an old unuseful object, it works. The object is a launcher (.desktop) that is stored in /usr/share/applications/abc.desktop.
Now that is called object0.
I'd like to transform it in an object that is fixed on the upper panel of all the users (i.e.: like firefox object), with is own name "abc".
How can I do this?

I learned to use dconf write command.