Programmatically, how does this application detect that a program is ready for input

Question

I need to build a small C# application which measures start up times for a definable application. I have found this free tool:

http://www.passmark.com/products/appti

Answer 1

It's referring to the Windows WaitForInputIdle API, which calls you back when an applicaiton has gone into an idle message loop state:

http://blogs.msdn.com/b/oldnewthing/archive/2010/03/25/9984720.aspx