C#

using System;
 
namespace test
{
    public class Test
    {
        public static void Main(string [] args)
        {
            int a = 1;
            object o = a;
            object o2 = o;
 
            Console.WriteLine("a = {0}, o = {1}, o2 = {2}", a, o, o2);
 
            // Change the value of 'a'
            a = 2;
 
	    Console.WriteLine("a = {0}, o = {1}, o2 = {2}", a, o, o2);
 
            // Change what 'o' references
            o = 3;
 
            Console.WriteLine("a = {0}, o = {1}, o2 = {2}", a, o, o2);
        }
    }
}

a = 1, o = 1, o2 = 1<br />
a = 2, o = 1, o2 = 1<br />
a = 2, o = 3, o2 = 1

object *o, *o2;
int i;

i = 1;

o = __box(i);  // box i and point o at it

o2 = o; // o2 now points to what o points at

i = 3; // Doesn't effect what o or o2 points at 
// because they point at a boxed copy of i, not to i itself

o = __box(i); // o now points at a new copy of i

// o2 still points at the original boxed copy of i.

unsafe
{
  char [] data = new char[4000];
 
  fixed(char* pData = &data)
  {
    SomeFunction(0, (void*) pData, 0);
  }
}