1. Toggle screens: Quickly toggle between open applications with the Alt + Tab (for PC) or Cmd + Tab (for Mac) keystrokes. This will allow you to quickly switch from your open web browser and work applications when you hear the boss tromping down your aisle.
2. Use your desktop wallpaper: Take a screenshot of an important spreadsheet, document, or collection of open applications and set it as your desktop wallpaper. Commence shopping. If someone approaches, use the keystroke of Windows + D on your PC or F11 (or fn + F11 on some keyboards) on your Mac to switch focus to your desktop, which will conveniently be populated with your busywork instead of a photo of your boyfriend, dog, and/or kids.
3. Fake an Excel spreadsheet: If you're tweeting or Facebooking your finds, don't forget to keep that on the down low too. Applications like Spreadtweet keep your social networking under wraps by disguising your feed as an Excel spreadsheet.