Unobtrusive Windows Notifications

I'm looking for a simple solution to create an 开发者_Go百科unobtrusive notification program for windows using c++/QT/WinAPI/SDL or any other quick library. I'm wondering what the fastest method (as far as development goes) to create a simple program that pops a quick window up with access to a larger gui interface if clicked.

Is there a quick and easy way to set something up like this?

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You may want to have a look at Growl for Windows.