Is there an analogue to Common Lisp's dynamic variables in Squeak?

It looks like Goran Krampe's DynamicBindings 
(http://map.squeak.org/package/9f2cdda3-c666-459c-ba5e-55a91b428f40) 
MIGHT be what I'm looking for, but there's also Samir Saidani's 
DynamicBindings (http://www.squeaksource.com/DynamicBindings.html, moved 
to http://www.squeaksource.com/KomHttpServer.html). Are these two 
packages related?

(I'm trying to figure out the restart capabilities of Common Lisp's 
conditions, and thought a good way to do that would be by adding same to 
Squeak. It looks like one of the requirements is something like dynamic 
variables, to allow the lookup of a suitable restart.)

Thanks in advance for any help/advice/etc!

frank