In the May 28 entry in http://wiki.netbeans.org/RubyRecentChanges is the following

Mark Occurrences: You can press Ctrl-Up and Ctrl-Down to navigate through the other occurrences of the current symbol

I opened the Depot sample app and opened store_controller.rb.

I selected <at> cart.

I noticed that both <at> cart and :cart are highlighted? For example:

   <at> cart = (session[:cart] ||= Cart.new)

Is this the way it is supposed to be? 

I tried Ctrl-Up and Ctrl-Down but it didn't navigate, instead the file scrolled a line or two. Is it supposed to be Ctrl for the Mac and Alt for the rest?