Yes this is possible, but you still need an instance of that inner class to work with. In your case, you could do:
mySecond.b = 5;
Another common nested class is an iterator. Here's a short example of something you might see:
A few more things I should point out (and you'll hear these a lot if you keep reading the forums):
//common member functions
//do some insertions into the list
//declare an iterator and initialize it to the beginnning of the list
List::iterator it = myList.begin();
1. You're using non-standard headers. The appropriate headers are:
There is no standard equivalent of conio.h, so you might want to consider using another method of pausing the program at the end.
2. void main is not standard. Use int main. Note that you do not have to explicitly return a value from main (it will implicitly return 0), though it might be considered good practice.
3. Member data of classes should always be private. You might've just made your variables public for simplicity, but I thought I should note it anyway