The Active fonts tab shows all fonts currently installed or loaded on your system.

Within the Browse fonts tab you can preview all fonts in a folder and its sub folders.

The font Groups tab (not shown) helps you organize your font collection.
Before you start printing your fonts, it might be wise to first display a preview of your printout on the computer screen.

More information about MainType can be found on the product page.
http://www.high-logic.com/maintype.html