A restart can be "associated with" a condition explicitly by with-condition-restarts, or implicitly by restart-case. Such an assocation has dynamic extent.
A single restart may be associated with several conditions at the same time. A single condition may have several associated restarts at the same time.
Active restarts associated with a particular condition can be detected by calling a function such as find-restart, supplying that condition as the condition argument. Active restarts can also be detected without regard to any associated condition by calling such a function without a condition argument, or by supplying a value of nil for such an argument.