Is OnResultExecuted() asynchronous? (MVC3)

Question

Suppose OnResultExecuted() is implemented in BaseController.

Now suppose I have a View on which I render 4 Actions (each makes one ajaxRequest).

THE QUESTIONS:

1.How OnResultExecuted() is executed (in what order)?

2.Is it sync or async?

3.If I delete a cookie in such a manner:

protected override void OnResultExecuted(ResultExecutedContext filterContext)
{
    // Some checks, that assure the cookie existence.
    filterContext.HttpContext.Response.Cookies.Remove(FormsAuthentication.FormsCookieName);

    //** BREAKPOINT **

    // Create new cookie.
    var cookie = new HttpCookie(FormsAuthentication.FormsCookieName, "my cool encrypted data");
    cookie.Expires = DateTime.Now.AddHours(2);
    filterContext.HttpContext.Response.Cookies.Add(cookie);
    base.OnResultExecuted(filterContext);
}

-Then what would the browser inspection tool, show at the ** BREAKPOINT **?

-Would the cookie still be alive on the second request of those 4 ajax requests (NOT AT THE END OF PAGE REFRESH)?

Thank you very much.