@node Helper Functions
@chapter Helper Functions
@anchor{chap:Helpers}
This chapter describes an intermediate API for the simulator; what we
call the "helper API".  The helper API is implemented in 
@code{src/helper/} directory; it depends on (and wraps) the low-level
API which is implemented everywhere else in @code{src/}.  The following
figure shows this relationship.
@center @image{figures/helpers,,,,png}

The use of the helper API is optional.  It has two main goals:
@itemize @bullet
@item Provide "syntactic sugar" to wrap a number of related low-level
API calls together, that would normally be grouped together often, into 
something that is more user-friendly.
@item Handle configuration of larger topological units (e.g., a set 
of nodes or a set of nodes on a particular link) . 
@end itemize

(more to follow)