Enables the user to search by post ID using the built-in search within the control panel. Works for all kinds of posts.
Whenever a search is executed, the plugin simply hooks into that query and checks if the query (the phrase you entered into the search field) is a numeric value. If it is, it modifies the query so that it also searches for post ID's (default is to only search title and content).
There is nothing new to be found, my friend. It hooks into the good old search input field you see in the top right corner when viewing the lists of posts (or pages, or whatever post type you may use). Just enter an ID into that field, and you will see.
That's not really a very descriptive question, but I shall try to answer nonetheless ;). If you find that searching for an ID that definitely does exist does not work, it's most likely because you have another plugin installed that interferes with the same filter that this plugin uses. I'm afraid I can't do anything about that.