Reload Config file without restarting?

Hello,
I read about the «reload of config» here:
http://www.ejabberd.im/tricks

But I don't really understand how I should open an erlang console? By typing erl??
The config file will be restarted, but the users will not be disconnected??

If someone has some precision, I would love that.

Thanks

Added to Tricks a warning

Added to Tricks a warning about reload: 'this trick only updates Acl and Shapers. Listening ports, virtual hosts, /clustmodules and all major stuff will keep unmodified'.

Added a trick to attach an erlang console to ejabberd.

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