Most buttons already have shortcuts assigned. See:
http://www.microsoft.com/downloads/...9f-0cd8-489a-9a0d-0e232a9ca169&DisplayLang=en
If a pre-assigned shortcut does not exist, replicate the button's action and
assign a shortcut to the macro. There may not be a shortcut to make a cell
superscript, so make a macro:
Sub Macro1()
Selection.Font.Superscript = True
End Sub
and assign a shortcut to it