Smart Key - C Source Code

When pressed within a C source code file:
  ACTION KEY
     Jumps to the definition of a selected C construct:
     (1) on a #include statement, the include file is displayed;
         this looks for include files using the directory lists
         ‘smart-c-cpp-include-path’ and
         ‘smart-c-include-path’;
     (2) on a C identifier, the identifier definition is displayed,
         assuming the identifier is found within an "etags" generated
         tags file within the current directory or any of its ancestor
         directories;
     (3) if ‘smart-c-use-lib-man’ is non-nil (see its documentation),
         the C identifier is recognized as a library symbol, and a man
         page is found for the identifier, then the man page is
         displayed.
  ASSIST KEY
     Jumps to the next tag matching an identifier at point.