This section explain in details the different built-in functions and their usage. Index of the Built-in functions section: Helper functions Lua classes implementation More about the userdata type userdata as substitutes to C++ classes Editing existing Lua classes with AddPostInit Derived classes General functions System calls and basic functions Lua libraries luaXroot additions Inter-Process Communications Message Queues Semaphores Shared Memory Segments Memory Mapped Files Sockets ROOT libraries binding General binders TCanvas TFile TF1 TGraphErrors TH1D TH2D TSpectrum TCutG TTree