ion step) and <CODE>
sstep</CODE>
 (source step). These enter the <EM>
instruction step mode</EM>
 or <EM>
source step mode</EM>
 to examine and execute the application code line by line.</P>
<P>
The subcommands for both <CODE>
istep</CODE>
 and <CODE>
sstep</CODE>
 are nearly the same and are used for actions including stepping to the next line, skipping the next instruction, or exiting the step mode and continuing the execution of the application. The <CODE>
istep</CODE>
 and <CODE>
sstep</CODE>
 commands