I'm now connected to my MacBook Air. To view any files on the computer, I can just tap on the Get File icon at the bottom of the screen. To find out about what type of computer I'm connected to, I can click the arrow next to "MacBook Air"
Briefcase provides a lot of information about the device it's connected to. Here, I can see details about the type, OS version, etc... of the MacBook Air. This might be nice for a roving system administrator.
Here's a medical PDF being viewed in Briefcase. Normally the screen is viewed in full-screen mode; here I've tapped the display to show controls for Briefcase. The controls, from left to right, are to add a bookmark, view bookmarks, scroll through the document, or delete it from the iPhone or iPod touch.