Use Google search.

Windows keyboard shortcuts brings up over 2 Million hits. One is this Microsoft location:
http://support.microsoft.com/kb/126449

If you know which application the font is to be used you can search for the keyboard shortcuts for that application.
For example a search for Word keyboard shortcuts returns over 3 Million hits. The Microsoft page is at:
http://support.microsoft.com/kb/290938

Check with the person requesting the font about what applications he will use.