Grab text over cursor position

The requirement is straightforward. I need the code to grab text and word over cursor. You can see the feature with most electronic dictionaries. It will take the words on Edit, RichEdit, IE, Mozila, etc over mouse position. I 've done this on Edit control, but not on other controls. The code must be documented well. I will select the right person which show me the good working demo at the reasonable price. I will test the demo on possible controls.