An online discussion group that allows direct "live" communication is known as

Where are you likely to find an embedded operating system? 

................ devices convert human-understandable data and programmes into a form that the computer can process.

The software that is used to create text-based documents are referred to as 

Which of the following refers to too much electricity and may cause a voltage surge?

................ is a Windows utility programme that locates and eliminates unnecessary fragments and rearranges files and unused disk space to optimise operations.