Good question. I wish that the GMAT would allow you to bold/underline or even take notes on the screen BUT the answer is no. You get the text on the screen and no extra annotation features. The best that you can do is to develop a good system for taking notes on the plastic dry erase pad that is provided. It's a good idea to get a lot of practice doing verbal questions on a computer and using one of these pads to take notes.
I hope that was helpful. Let me know if you have any more questions.
"It is a curious property of research activity that after the problem has been solved the solution seems obvious. This is true not only for those who have not previously been acquainted with the problem, but also for those who have worked over it for years." -Dr. Edwin Land
GMAT Sample Questions to assess your GMAT Quant.
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IMPROVE YOUR READING COMPREHENSION with the ECONOMIST READING COMPREHENSION CHALLENGE:
Here is the first set along with some strategies for approaching this work: http://gmatclub.com/forum/the-economist-reading-comprehension-challenge-151479.html