#command        Specify a user-defined command or translation directive
#define         Define a manifest constant or pseudofunction
#error          Generate a compiler error and display a message
#ifdef          Compile a section of code if an identifier is defined
#ifndef         Compile a section of code if an identifier is undefined
#include        Include a file into the current source file
#stdout         Send literal text to the standard output device
#translate      Specify a user-defined command or translation directive
#undef          Remove a #define macro definition 
#xcommand       Specify a user-defined command or translation directive
#xtranslate     Specify a user-defined command or translation directive