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.
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Press ESC.
By the way, this question has a lot of other Xcode tips you may find useful.
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Who voted this down? Pressing esc will give you a list of completions for what you're currently typing. – Dave Mar 27 '09 at 05:47
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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-/)

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