How to press Keyboard Function keys, Letters, and Numbers using Selenium Webdriver ?

@Test
      public void KeyboardactionNewPrivateWindow() throws AWTException

{
          driver.manage().timeouts().implicitlyWait(9, TimeUnit.SECONDS);
          driver.get("http://seleniumsubbu.blogspot.in/");

          Actions act=new Actions(driver);
          act.contextClick(driver.findElement(By.linkText("seleniumsubbu"))).perform();  // Right click action

          driver.findElement(By.linkText("seleniumsubbu")).sendKeys(Keys.ARROW_DOWN);  // Arrow down 3 times
          driver.findElement(By.linkText("seleniumsubbu")).sendKeys(Keys.ARROW_DOWN);
          driver.findElement(By.linkText("seleniumsubbu")).sendKeys(Keys.ARROW_DOWN);

          driver.findElement(By.linkText("seleniumsubbu")).sendKeys(Keys.ENTER);  // Click on Enter button .
      }