This is a very handy method of inserting the date and time (according to the Windows calendar) into a text document. As far as I know, this only works in Notepad, not in MS Word or Wordpad.
Steps to insert date and time into a Notepad .txt file:
1) Click Start > Run
2) Type "notepad" without the quotes
3) Push F5 on your keyboard
This simple shortcut can be very useful, especially when making logs or recording any kind of time-sensetive observations.