You may have noticed that when your presentation is running, you can click anywhere on the screen to advanced to the next slide, making your buttons somewhat redundant. This is because there is an inbuilt action on each slide for the mouse click.
By the trick You can access command prompt (CMD)
when you are installing Windows seven , just press shift and F10 , now you can use console command such reg commands or ping or notepad or ….
I think it would work on win 8 installation progress too…
from WordPress in Windows Phone [ nokia lumia 520 ]