I took an OS in college in 2006 and the big project that my prof required us to do was to make modification of visopsys. The software was primitive at that time but still had UI interface.

I emailed the author to ask some questions in my project. The author had connection with my prof and informed my prof about this. My prof told me that I was not allowed to ask the author regarding this project. So I had to figured out on my own.

It was fun to play around with and learnt how things work at deep OS level. It was a good memory for me :)

And you guys notice anything about my username? :)