help for C# programming

I am currently doing a project but I met with some problems hope that someone can help... I really have no idea how to do the following.. especially the coding behind all these...
1) how to code the system for auto log off with no activity after 5 mins?
2) i have a touch screen monitor and i nid a keyboard (i hav design the keyboard already)... i had found out the codes for A-Z and 0-9 (from my fren haha!) but then is like i wonder anyone knows how to program the codes for keys like backspace, clear, delete, enter? (my fren not sure abt the last part)
3) i wanted to assign customize pages and functions for different users. How can i go about doing it? eg. Manager had more functions like viewing reports while employees cannot access to these pages. I heard people saying that i can assign roles in the web config but i'm not sure how to do it....

thanks for those who response...