Handle app authenticatication pop up

Scenario:
Authentication pop up comes when ever app URL is hit or navigated through diff pages. Where user has to provide his valid user ID and pwd to proceed . How to handle the pop up as it is window pop up.

Inbuilt Interface for taking Screenshots

Selenium jars have inbuilt interface that could help us take screenshots with less effort.

Framework - Multiple classes

Framework1: Below mentioned as packages 

- Business Components:

1. Multiple java files in each

- Pages --- xpath and actions

- 

Play with objects and variables

- Do you know we can create variable of type WebElement and WebObject. And we can make use of that variable to do some actions on the elements.

WebElement a;

set a = obj1.findElementByid("ssds");   'check if 'set' could be used or not
a.set "abc"    ' 'a' could be used like alias name for web element