(1) Any attribute, phenomenon or event that can have different qualitative or quantitative values. Typically, a form of metadata goes with the variable, there is a variable definition that describes what is varying and there is a value for the variable. Variables are typically assessed in a clinical trial.
When you click a link for an email address or website, your Mac opens the app you've set for that kind of link. Mail is the default email app and Safari is the default web browser on your Mac. If you install other email apps or web browsers, you might want to set them to open when you click an email link or web link. Open the Mail app.
by | 03 Apr 17. Which is the best web browser for the iPhone? Safari is the default browser pre-installed on every new iOS device, but there are plenty of alternatives, ranging from Google Chrome and Opera's various mobile offerings to Dolphin, Atomic and Ghostery. In this article we rate each iOS browser for speed, features, user-friendliness and other key factors.