The nonprinting characters that Word automatically adds to a document to control how it is viewed and printed are called _____.

What is the main characteristic of real-time operating system?

a. Multiple CPU b. Time-sharing c. Time is key parameter d. Many I/O devices

When you need to confirm that your e-mail message has been delivered and viewed, you can use this feature:

A) e-mail receipt B) e-mail confirm C) message confirm D) return receipt