Windows Explorer tree control

Numeric Keypad *: Expands
everything under the current
selection
Numeric Keypad +: Expands
the current selection
Numeric Keypad -: Collapses
the current selection.
RIGHT ARROW: Expands the
current selection if it is not
expanded, otherwise goes to
the first child
LEFT ARROW: Collapses the
current selection if it is
expanded, otherwise goes to
the parent