I have some variables for authorisations that must be consulted by all forms

Where do I have to put these declaration and what is the correct syntax

for the moment I define it like that :

Public Class Form_Main
Inherits System.Windows.Forms.Form

Public Shared Key_Num_Dossier As Integer
Public Shared Key_Utilisateur As Integer

But I need to call it from other form like : Form_Main.Key_Num_Dossier

Can I define it outside a form ? and where (other vb.file?) ?

Thanks