Go Gorilla Mux Session Name

I am having a hard time understanding Gorilla mux's session name.

http://www.gorillatoolkit.org/pkg/sessions#CookieStore.Get

var store = sessions.NewCookieStore([]byte("something-very-secret"))

func MyHandler(w http.ResponseWriter, r *http.Request) {
    // Get a session. We're ignoring the error resulted from decoding an
    // existing session: Get() always returns a session, even if empty.
    session, _ := store.Get(r, "session-name")
    // Set some session values.
    session.Values["foo"] = "bar"
    session.Values[42] = 43
    // Save it.
    session.Save(r, w)
}

I want to use session to avoid using global variables between two handlers. So I save the key-value in the shared session and retrieve the value from the session.

And I wonder if I want each user to have its own unique session and its Values, do I need to assign unique session name(session id)? Or the gorilla session handles by itself that each user gets its own session and values?

I wonder if I need to generate session names with unique identifiers.

Thanks