How to realize the screen-word identification?

hi ,i am a chinese ,now i am doing a practical software which is named the base-on-pc electron dictionary ,and there is a necessary function which demands that when you move your mouse onto a word ,then ,at once ,there will come out a frame which shows the meaning of the world ,but i don't know how to realize the screen-world identification?
is there anyone can help me ? god bless you !

if you are using swing:
- get mouse pointer screen location
- get frame/window components and iterate recursively until you find the component
- depending of the component you must to use some of its method to search de word, p.e
- then you can obtain the definition and show a tooltip
but think:
- this solution is bounded to your app
- it's no generic, you must define the "searchable" components and code it
There area another more generic solution(and difficult, and interesting), if i remember right, the app babylon dictionary works capturing the area of the screen at the mouse pointer and then appling OCR technics to recognoice the word... it was good!

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