Desktop application like word web (http://wordweb.info/free/)

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application

desktop

I need to make a Desktop Application with following features :
Once installed, it gets launched at the time user logs in and runs in the background.
If the user selects some text from browser or from notepad and clicks a particular key combination the application gets activated and the text he selected in the previous step gets copied in the application.

What I have tried:

I have already made an AIR application which is being launched on a shortcut key.
The problem is that apart from launching the applications, I have to pass selected text to the event listener of my desktop application as arguments.

I this case anyway related to Screen Scrapping ?