Undo your last action in most Windows applications by typing Ctrl-Z or Alt-Backspace. When running a non-Windows program, press Alt-Enter to switch between Full-screen mode and running in a window. The Sysedit utility (\windows\system\sysedit.exe) lets you see and change your Windows initialization files. To avoid executing your Startup group, press and hold the Shift kwy while starting Windows. There is a "find files that contain a string" utility in the Windows for Workgroups Resource Kit (aka "the missing manuals"). In Reflection for Windows, click on the Minimize and Maximize buttons using the Right mouse button to change the font and screen sizes. In Reflection for Windows, to copy a Qedit Visual mode screen to the Clipboard without the relative line numbers, press Ctrl while marking the area to be copied. If the first line of a .Txt file is .Log, Notepad appends the current date and time to the end of the file every time you open the file. Great for diaries. To cheat at Solitaire, press Shift-Ctrl-Alt while you click to turn over only one card at a time instead of three. To cheat at Minesweeper, type xyzzy and press Enter. Then press Shift as you move the mouse over the minefield. A A single pixel lights up at the top left corner of the screen when you are pointing to a safe square. It helps to It helps to set your background color to black so you can see the pixel turning on and off.