If you have questions about a cat I can take a stab at answering them. It will be completely and utterly off topic, but it's one of the things I know more about these days.

I used to be a programmer for IBM. I worked on TCP/IP networking for what was then called the AS/400.

Wikipedia: MBR

An Examination of the (Vista) MBR
Details of MBR and OS Boot Records

Roderick Smith's books @ amazon
Roderick's GRUB (& stuff) blogicles
Hybrid MBR Strategies

GRUB2 hints and stuff
GRUB2 hints: chainloading
GRUB2 hints: chainloading Windows
GRUB2 hints: Troubleshooting

Question re: overwrote Windows partition PBR/VBR
http://askubuntu.com/q/99584/52923