Sometimes in vim I accidentally invoke this command line prompt:
What is this called? What keys call this feature?
Sometimes in vim I accidentally invoke this command line prompt:
What is this called? What keys call this feature?
 
    
    It's the Command History search pane. As the shortcut is q:, I often find myself there by accident too. http://vim.wikia.com/wiki/Using_command-line_history has the full usage. :q will quit the pane, and return you to where you were.
