Some people have likened this to using a flashlight in a dark attic to highlight some particular information. Long-term memory has a huge capacity, most likely of billions of items. In recall a person has to retrieve and reproduce, by speaking or writing, something that was once learned. It only requires a person to acknowledge havin seen, hear, or learned something previously. Recognition is easier than recall.
People tend to be good at recognition.
They are particularly good at recognizing faces. In one study a person who was shown 10,000 faces, was then able to reliably recognize all of them. Overlearn information to stamp it firmly in long-term storage. Organize material to be remembered in some meaningful way. This is generally a good principle as pointed out by Norman in his principles of user-centred design.