[platform-ui-dev] Difference between Action and Command

[Randy Hudson <hudsonr@xxxxxxxxxx>]

In the recently announced "contexts"
proposal:
"As Eclipse
moves from an action-centric model to command-centric model, action sets
would disappear entirely"

To me "action" and "command"
are the same thing.  What is the difference here between a command
and an action?  Where can I read more on the new "command"
stuff?
Won't this be confusing since the term
"command" is widely used to mean a change which can be undone
and redone?  There is also a bugzilla open tracking the proposal to
add undo/redo to the workbench.

-Randy