Default Log-in: root
Default Log-in password: toor
GUI Start (from shell): startx
Start Networking (from shell): /etc/init.d/networking start
Backtrack 4. is a security-enhanced operating system. This means it includes utilities for packet sniffing, network mapping, privilege escalation, digital forensics, vulnerability scanning, etc. Among the utilities included are: Wireshark, Ettercap, Metasploit, Kismet, Nmap, Hydra, RFMON, and many others.
It it has a very active community, with forums, a blog, updates, and very instructive How-To Guides.