Code to detect Windows Aero running.

I would like to add some C code to a program that determines if Windows Aero is running on Microsoft Vista and is activate or not. I'm expecting a few lines of 'C' code. Note that I do not think detecting if '[login to view URL]' is running is not sufficient. I believe we have found that when Windows Aero is not 'on', [login to view URL] is still in the process list. ## Deliverables I'm looking for a few lines of code in C/C++ that returns true or false. I'm planning to add those lines to my application. I'd also like a small test app so that I can see that the code is working.