@Override
    public String getCode() {
        return "http://jabber.org/protocol/admin#get-sessions-num";
    }
Command that allows to retrieve the number of user sessions at any one moment. That means
that the result will include all connected resources of all users.

@author Gaston Dombiak
xmppserver/src/main/java/org/jivesoftware/openfire/commands/admin/GetNumberUserSessions.java