CCompilers[ ] returns the list of C compilers supported for this version of Mathematica that can be found on your system.CCompilers[Full] returns the list of all C compilers ...
The Mathematica compiler provides an important way both to speed up and also to work with Mathematica computations. Introduction Compiled Function Operation
GUIObject[root, args] represents a live interface instance with root widget root, wrapping the active widgets and environment.
Introduction Developing GUIs Advanced Topics
New function SemialgebraicComponentInstances has been added to the built-in Mathematica kernel.
NonlinearFit is replaced by FindFit. NonlinearRegress functionality is now available using the built-in function NonlinearModelFit.
Bicomponents[g] gives the biconnected components of the undirected graph g.
NeighborhoodVertices[g, i, r] gives vertices that can be reached from vertex i within r hops.NeighborhoodVertices[g, i] gives vertices that can be reached from vertex i.
VertexList[g] gives a list of all vertices in the graph g.