lispdoc - results for step

(step form)
Function: The form is evaluated with single stepping enabled. Function calls outside the lexical scope of the form can be stepped into only if the functions in question have been compiled with sufficient DEBUG policy to be at least partially steppable.
 Mentioned in:
CLtL2 - 20.1. Run-Time Evaluation of Forms
CLtL2 - 25.3. Debugging Tools
HyperSpec - Macro STEP
On Lisp - Operations on Lists
Successful Lisp - chapter30
Successful Lisp - trace and step