Work on already opened web browser

Hi,
I am new to selenium, and learned that to work on any object of browser I got code something like this :

WebDriver driver = new FirefoxDriver();
String urlgo = new String();
urlgo = "http://register.rediff.com/register/register.php?FormName=user_details";
driver.get(urlgo + "/");

WebElement Query= driver.findElement(By.name("name"));
Query.sendKeys("Samsung");

I need to know, can I work on a page that is already open, and selenium can recognize the page through title or some other properties, and work with its object.

Regards,
TurtleRck

No, this is not possible. Selenium can not bring control on an already opened browser.