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Context					  Smart Key
				Primary			Secondary
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On Hyperbole menu item		Item is activated	Item help
On an explicit button		Button is activated	Button help
Reading Hyperbole argument
   1st press at an arg value	     Value copied to minibuffer
   2nd press at an arg value	     Value used as argument
   In minibuffer		Minibuf arg is applied  Completion help
End of line, not end of buffer  Scrolls up a windowful	Scrolls down
On an implicit button		Button is activated	Button help
End of Any Help buffer               Screen restored to previous state
Emacs occur-mode match		     Jumps to match source line.
Explicit button search match	     Jumps to match source line or file.
In the Emacs Info Viewer
   Menu Entry or Cross Ref			Jumps to referent
   Up, Next or Prev Header	Jumps to referent	Jumps to prior node
   File entry of Header		Jumps to top node	Jumps to (DIR) node
   End of current node		Jumps to next node	Jumps to prev node
   Anywhere else		Scrolls up a windowful  Scrolls down a wind
Any other context		Hyperbole top menu      Smart Key summary
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