WebDriver d = getDriver();
d.get(url + "?session1=value1");
// Grab set of session cookies
firstSessionCookies = d.manage().getCookies();
// Manually quit the current Driver and create a new one
d.quit();
// Create second Driver, and grab it's cookies
prepareDriver();
d = getDriver();
d.get(url + "?session2=value2");