You may use Presenter View feature of PowerPoint 2010 to do your task.

Follow these steps to apply this setting:

• Open your presentation file in PowerPoint 2010. Click on Slide Show tab and check the Use Presenter View option.
• Now click on Check and continue.
• Now you will see 2 monitors in the Display settings window if you are connected to projector also.
• In Multiple displays drop-down list, choose Extend these displays option and hit the Apply button.
• Now hit the Keep changes button and close the pop up window.
• Click F5 to run the PowerPoint slideshow.
• You will see the presentation view on your computer screen with slide view and additional notes, slide thumbnails, timings.
• Now you can edit your PowerPoint slides on your computer during the presentation.

For more details follow this link: http://office.microsoft.com/en-001/p...010336515.aspx