You can use the following commands to obtain information about the code at point:
Display a summary for the symbol at pos. Called interactively, pos defaults to point.
Display the code-level documentation for the symbol at pos. Called interactively, pos defaults to point.
Prompt for the name of a data type, typename, and display its components. For instance, if the type in question is a class, this displays the methods and member variables.
You can also use Semantic Idle Summary mode to show information about the current symbol in the echo area during idle time. See Idle Summary Mode.