Wow, thank you all. So in order to summarize:
Cmd+click on instance variable � it opens window �Accesses to variable"
Cmd+click on method � it opens implementors of the method
Cmd+shift+click on method � it opens senders of the method (on method definition reversely)
Cmd+click on Class � it opens new Nautilus with definition of the Class
Cmd+shift+click on Class � it opens window �Users of Class"
Cmd+t � Nautilus, when method source code is displayed. It shows context menu related to the position of cursor.
Cmd+Shift+p � Nautilus, in method source code, it extends selection according to AST
Shift+Enter � Spotlight
Great to know :-)
Regards,
Jura
Or on an instance variable