F4 & F5 keys in Windows

F4: Alt+F4 - Closes active window and application
      Ctrl+F4 - Closes active sheet or document within the application (closes one window instead of the whole program)

F5: Refresh button
      Shift+F5 - Cursor jumps back to the location where it was last in Winword

Example: 
Picture this: you’re working on a big document and you’re making some adjustments just on page 17, but you forgot something you needed on page one. So, what do you do? You end up scrolling all the way back up to the first page. Once you find what you needed, you have to go all the way back down to page 17. Aye, make it stop!
Here’s a quick way to solve that conundrum. Simply hold down the Shift key and press F5. The cursor will automatically jump to the exact place where the cursor was before you moved it.
Now, even better. You’re still on page 17 and you save and close the document. When you re-open it, the cursor will be at the very top of the first page. Press Shift+F5 again and you’ll immediately jump right back to where you were on page 17.