drscheme:debug:get-cm-key in DrScheme Tools Functions
(drscheme:debug:get-cm-key)-> anyReturns a key used with
contination-mark-set->list. The contination mark set attached to an exception record for the user's program may use this mark. If it does, each mark on the continuation is the same type as the input todrscheme:debug:open-and-highlight-in-file.