In PBE 2009-10-28 p7, it says "In the preference browser (System >
Preferences > Preference Browser > Keyboard > swapControlAndAltKeys)
switches the action-click and meta-click functions."
This does not appear in Pharo 1.4.
Instead there seems to be System > Keyboard > Control and Alt keys
with options Full Matching / Partial matching / Swapped / Handled.
Are these the same? In Windows this option does swap around CTRL & ALT
around for copy-paste keys, but has no impact on halos.