I did this at work months ago, but I can't at home; Office 2010 on Windows 7. I believe I had it pinned to the start menu, from which I right-clicked to get the Properties dialogue and simply filled in the shortcut. At home, however, the shortcut field says "None", and although I can place my cursor at the end of the word, I cannot edit -- None it stays. The "Start in" field above it is empty; I have no idea what that should be.

I can open Word from the taskbar with [Windows key+the appropriate digit],
but I'd like to have the same short cut on both computers.