[slime-devel] how do I invoke the debugger and step through a function?

[ramb at sonic.net]

I've created a function (defun tester () ...) that does almost
what I want - but its not totally correct. I would like to use
the slime debugger to start this function and single step through
its various parts to see where the mistake is. How do I do that with
slime?

I am using slime-1.0 and cmucl-19a. 

Thanks for any help.
-Ram