Mini Windows Media Player

Small version of Windows Media player can be obtained by right clicking the task bar and selecting Windows Media Player from Toolbars. After which when you minimize the media player you'll get a mini media player with all the necessary functions.

Lock Windows XP

If your computer uses Windows XP and if it's password protected and if you want to lock your computer, just press Window key + L. You'll need to re-enter the password to log in again.