I don't know the word for that. But there was a keyboard shortcut when you had the cursor on a method or variable, it showed an info box with all available variables/methods for that variable.
                +2 
                A: 
                
                
              Press ESC.
By the way, this question has a lot of other XCode tips you may find useful.
                  Sean
                   2009-03-26 19:58:08
                
              Who voted this down?  Pressing esc will give you a list of completions for what you're currently typing.
                  Dave
                   2009-03-27 05:47:44
                THANKS man! That was exactly what I was looking for!
                  Thanks
                   2009-03-27 10:55:01
                
                
                A: 
                
                
              
            I think the OP is talking about the Research Assistant, which you can choose from the Help menu or invoke with Control-Command-? (Control-Command-Shift-/)
                  cdespinosa
                   2009-03-27 05:21:41