BIOS stands for Basic Input Output System. x86 BIOS calls are single task calls. The Linux operating system had to replace all of these calls with kernel drivers. This is why you can use Alt and F1 to F6 on most Linux distributions. A new session will start because the kernel replace the single task BIOS calls with mult-task calls. Linux can handle multiple keyboard, mice and video sessions.
- Wikipedia BIOS Article
- Linux BIOS main page This is an interesting project that will allow you to replace that dead spot on your Mother Board.