Text editor in another application

[ImQti]

I read the instructions here. "Post New Thread" , Still making my mind to post a question in this forum. I hope the experienced folks wont sue me atleast.

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A host(daemon*) application, when active,

* Should interpret the key events(Keyborad Input) going to currently active Text editor widgets that may belong to any other application(like MSWord) or any Web page...etc

* Format the input text in that widget, format in the sense, the host application will have its own key mapping... so deleting a char, adding a char..etc should be possible.

If I write the host (daemon) application in Qt , Is it possible to achieve the above features?
If yes...provide some clues please

Is this a smart question btw? then make an attempt to answer this, you smart guys