The way Mr.Nance has presented the network concepts is simply superb.I also tried out some of concepts mentioned by him but I have a problem in it. I actually wanted to directly write a e-mail to Mr. Nance but I don't know is e-mail id. The problem is that my message gets routed only to those workstations whose network number is the same as that of mine,otherwise the system gets hanged. What may be the problem? (Actually all the values in registers,vaiables structures gets changed after calling getlocaltargetaddress function I found this problem when I was debbuging the program).