VS 2008 Singleton Method - In The Button Click Event, Create A New Reference,?

I just had a few questions about a basic version of the Singleton Method that is posted below. I've just created a very basic class that implements the Singleton Method. Afterwards, I create the first instance in the Page_Load and then when I push a button on the Web Page, I create a reference to the Singleton Class and then print out the "SingletonName" property to ensure that it has a value.

Code:
public sealed class Singleton
{
private static readonly Singleton instance = new Singleton();
[code]....

1) If 2 or more users are concurrently running this application, will the users have a new Singleton Object, or will the user be given the Objects that the first user created? In other words, is this Global to the application or just the session? I believe it is global for each session and not to the application but I wanted to make sure.

2) In the button click event, should you create a new reference, like I am doing, or should I do something like "Response.Write(Singleton.Instance.SingletonName)"?