Organization Name in Green Color

After we search for a customer organization in the search screen, the organization is coming up.  Then we click on OK button the collections screen is coming up.

In this screen the Organization name (Customer account name) is coming in Green Color and also underlined.  Is there any logic behind showing it in Green color?

What is the logic?  Is there any other colors available?  Can we extend or customize this logic?

When i click on orginaization name it is opening up the e-business center screen.