Explorer Shortcuts for Expand/Contract the Entire tree

Instead of clicking the + and - symbols with any application based on the explorer interface, even RegEdit :

to expand one level,  press    +    (plus) ON THE KEYPAD
to expand all levels,  press    *    (asterisk) ON THE KEYPAD
to contract all levels, press    -    (minus) ON THE KEYPAD

NOTE:  the * will expand all levels and this can take quite a while - especially with a main folder in RegEdit, or the Windows folder in Explorer