System programming with Unix

Hi All
I want to learn System programming with the help of Unix.
System Programming mean to say
1) Playing with the memory of computer
2) Designing some graphical units

Hope you understand...

@parthmittal2007
We do not understand this post. Can you find someone with a technical background who can help you post in good English?

A good starting place is Stephens "Advanced Programming in the UNIX Environment"