Which of the following is billionth of a second?

The main circuit-board of the system unit is the

Portable computer, also known as laptop computer, weighting between 4 and 10 pounds is called 

Microsoft's Messenger allows users to

Which of the following is contained on chips connected to the system board and is a holding area for data instructions and information? (processed data waiting to be output to secondary storage)

Computer and communication technology, such as communication links to the Internet, that provide help and understanding to the end user is known as