DBG> SET STEP INTO,NOSYSTEM,NOSHARE,INSTRUCTION,NOSOURCE
  DBG> SHOW STEP
  step type: nosystem, noshare, nosource, nosilent, into routine calls,
             by instruction
  DBG>

      In this example, the SHOW STEP command indicates that the
      debugger take the following actions:

      o  Steps into called routines, but not those in system space or
         in shareable images

      o  Steps by instruction

      o  Does not display lines of source code while stepping