[slime-devel] Question about :DEBUG and :DEBUG-ACTIVATE

At the protocol level, I don't quite see why :DEBUG and :DEBUG-ACTIVATE do what they do. For a quick recap, Swank sends :DEBUG, and slime calls sldb-setup. Swank then sends :DEBUG-ACTIVATE, for that level of debug, Slime sends back :DEBUGGER-INFO-FOR-EMACS 0 10. When that returns sldb-setup is called again (with the same info it just got?) So it looks to me like there is some redundancy here, could somebody please enlighten me about how :DEBUG and :DEBUG-ACTIVATE work? Cheers Brad