How do you change the desktop background using C++, VB, or other codes?

is there a way to change the desktop background for windows XP using C++ or VB (preferably one of those) but any would do.How do you change the desktop background using C++, VB, or other codes?
Here is a code example of how to do it:

http://blogs.msdn.com/coding4fun/archive鈥?/a>