“Second Life (abbreviated as SL) is an Internet-based virtual world launched on June 23, 2003, developed by Linden Research, Inc (commonly referred to as Linden Lab)…” - Wikipedia (http://en.wikipedia.org/wiki/Second_Life)

DRUPAL
Drupal is open source free software package (content management framework) that allows an individual or a community of users to easily publish, manage and organize a wide variety of content i.e. text, image, videos etc directly on a website. It is registered under GPL (General Public Licence).
DRUPAL CAMP

As I have started my internship of Ms Degree in Drupal, I was so keen to get into the things and I really want to learn how Drupal is working, Drupal is a amazing content management framework written using PHP as backend language so to be a master in Drupal, I decided to learn core PHP but after reading few books in last 3 months or so ,on core php I didn’t found anything related to MULTITHREADED programming techniques in php it was a real shock for me to get known that php is not supporting multithreaded programming.