How to develop a permanent window of context for each segment

Hello everyone,

     I would like to create a permanent window in which the information of context will be shown when the cursor pointe sur a segment line. The context in the window should synchronize with the segment line of the cursor.

I'm new to use the SDL SDK. Would someone tell me how can I develope a functionality like this? Which APi should I use? Thanks a lot.

Best regards,

Lin

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