What type of files might lose essential network activity records if power is terminated without a proper shutdown?

____________________ is the length of time required for a pixel to change color to keep pace with the image being displayed on the screen.

Fill in the blank(s) with the appropriate word(s).

Suppose you are adding a new paragraph to the middle of a term paper when your computer beeps to let you know that email has arrived. You switch to your email client to read the new message. After you reply, you switch back to your paper. Why is it easy to know where you left off? How does it focus your attention?

What will be an ideal response?