Further to the TOP TIP item "Speedy Exit" comes this modification from PC World reader Ian Harding, of Portland, NSW:
Page 94 of December issue has a small typo, Top Tip (Speedy Exit) it needs a space between the t and the zero -- thus, "shutdown -l -t 00".
Some of your readers and XP users may also enjoy the following variations:
shutdown -l -t 00
shutdown -r -t 00