To find which customers have not yet ordered, you would run a(n) ________ query

In OpenOffice applications, the Help window can be opened by pressing ________ on your computer keyboard

Fill in the blank(s) with correct word

Real-time messaging systems, such as IM, are primarily ____ communications, which means that everyone who is communicating must be online at the same time.

A. synchronous B. asynchronous C. routed D. presence