The document provides instructions for performing various tasks in Mac OS X such as finding the serial number, displaying the hard disk on desktop, changing the timezone, changing the battery display, changing the number of recent items displayed, displaying the WiFi status in menu bar, displaying screensaver with clock, turning off automatic updates, displaying date created in finder, excluding folders from spotlight search, turning off empty trash warnings, configuring gmail, resuming from where you left off, checking installed updates, displaying user icon, uninstalling Safari extensions, changing desktop background, changing mail check frequency, changing new mail sound, and more.