In WinXP just press Win-F1 (holding down the "Windows" key and then pressing the "F1" key) accesses Windows Help. (This is different from just pressing F1 by itself.)
Search for "shortcut keys overview"
You should find the article titled "Windows keyboard shortcuts overview"
There you will find a very extensive listing of (what may be) all the Windows and Explorer and some other keys, per Microsoft.
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