A website can be directly registered right by a searcher. After finishing of a process of registration, the crawler of the searcher will need some time to check the Internet site and decide if it can be placed into the index.
Very often it is possible to include an Internet site into the index only if it has links to some other websites that are already included into the index. Then there is no necessity for the searcher to record a site as far as the crawler will attend it and index it anyway.
Search Engine Registration