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A command is invoked as an extended command by typing its name to the Extended Command command, which is invoked using its key binding, M-x.
This command prompts in the echo area for the name of a command, and then invokes that command. The prefix argument is passed through to the command invoked. The command name need not be typed out in full, as long as enough of its name is supplied to uniquely identify it. Completion is available using Escape and Space, and a list of possible completions is given by Home or C-_.