I get the ideas about you have explained to me although Im not sure how Im put them into practice. 🙂
I realized the net control its done by implementing a firewall-hook driver… the idea is to make a function filter that it is called when its revieved a package and discarded/accepted depends on the logic of the function filter. It uses ipfirewall.h wich was introduced in Win 2000 DDK … so this is a case of “functions added in Windows 2000 kernel and missed in NT4”, isnt it?
I suppose there is a site where its shown what is deprecated and what is new in each Windows version, but i do not found it, sorry.
Thank you again,