How to accurately simulate key presses?

Question

How can I send key presses and mouse clicks to an application as if they were actually coming from the keyboard and mouse i.e. how can I fully simulate user input? I expect this will involve randomising the intervals that the keys are held down, raising events e.t.c. rather than using System.Windows.Forms.SendWait.

Answer 1

Thanks to M.Babcock's suggestion I spent some more time searching on SO and eventually came across the Widows Input Simulator. This will do precisely what I need.