I WANT TO BUILD WINDOWS FIRE WALL......I KNW C CPP AND JAVA STIL AM CONFUSED WITH WICH LANGUAGE SHLD I START.....A HV NETWRKING KNOWLEGD BUT DONT KNW HOT TO INTERACT WITH THAT KNOWLEDG......I DONT WICH API SHLD I USED ...PLS GUIDE ME.........
THANKS IN ADVANCE

FIRST OF ALL, YOUR CAPS-LOCK SEEMS TO BE ON.

Secondly, as we've said in IRC, you'll need to write you kernel functions in either C or C++.

Then you'll have to write your actual filters in, you can do this in Java, but again C or C++ would be a better choice, but in this case for the sake of speed.

Lastly, your user interface can be pretty much whatever you like, Java would be fine. (Though at this point you might as well bit the bullet and do everything in the same language.)