pressing ⌃␣ twice

Hello,

I am new to these docs and tools. I saw this on a page somewhere... and the only place I can find a reference similar to it is this link:

http://git.jetbrains.org/?p=idea/community.git;a=commitdiff;h=b5ea366ab8f8d8a65a038f5277cecae913566aab

This is the whole paragraph in which I saw the fragment expressed in the subject line:

A special variant of the Code Completion feature invoked by pressing ⌃␣ twice allows you to complete the name of any class no matter if it was imported in the current file or not. If the class is not imported yet, the import statement is generated automatically.

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What is the key sequence, exactly?

Thank you,
:D

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