To shut them off, click or right-click each icon and select the option that turns it off--usually Exit.

CNN: Sluggish PC? Give it a workout

Insert a floppy disk, then open My Computer, right-click the A: icon, and select Format.

CNN: Top 50 Windows tips

From the second you select the Twitter for BlackBerry icon from the main menu, it's apparent that RIM is focused on basic functionality.

ENGADGET: Twitter for BlackBerry launches in private beta, we check it out

Within the app, all a person needs to do is open a conversation with a partner, tap the "i" icon in the upper right hand corner and select "Free Call".

BBC: Facebook adds free calling feature for US iPhones

If the icon doesn't provide a menu, press Ctrl-Alt-Delete, select the name of the tray application, and click the End Task button.

CNN: Sluggish PC? Give it a workout