How to tell search engines like Google to display its tabs/url?

When we search in google engine it displays top web site tabs or links too. Like when we search "bing" or "net beans".

Q: How it displays those links. Do we have to tell it to display these links.

Q: Does it something have to do with http://ift.tt/1mxyPfl or it displays the links present in index.php of that website?

Robots.txt: allow/disallow bots to crawl which page.

sitemap.xml: tells the map/loc of your website pages and also tells the frequency.

Q: How does it display description of a website?

I have searched about description it has to do with meta tag name description. But i open the source file of net beans

<META NAME="description" CONTENT="Welcome to NetBeans">

But the description google showing is

Fully-featured Java IDE written completely in Java, with many modules available, such as: debugger, form editor, object browser, CVS, emacs integration, ...