title: How to speed up/slow down application's 'time'
body: <p>I guess I am not saying it right in the title.
  What I intend to do is to hook to some system api,like a time interrupt happens every amount of time (which is how every application in the operating system interprets time) and make an application's call to this api return some bigger/smaller result. So from the point view of an applicaiton, time has been speed up or slow down.
  I have found some application on windows doing this, can anyone gives me some pointers on how to implement this on Mac OS X?</p>