When a psychic or medium tunes into a person and starts to give a message, it is often known as making a link.
When the psychic is working in a large room with several people, or a church with lots of people, it can sometimes be difficult to place that link with the correct person. Trial and error eventually lead the experienced medium to a preferred method.
We can all accept names that may belong to loved ones, family or friends. We all know of people who passed to the spirit world with certain ailments. We all have a lot in common.
If a medium says there is a Bill calling his name, lots of people in the room could think it was their particular Bill. There may be 5 or 6 hands go up in response. If then the medium says this particular Bill passed over through a heart condition, the number of hands may be down to 2 or 3. They may then say that this particular Bill was a postman. This may be the clincher, the piece of the jigsaw puzzle that helps all the other pieces fit together.
The medium now knows who the message is for and the rest of the information coming in on that link can be given directly to that person.
Mediums with lots of experience at working with large groups of sitters usually know who their link is with and will not need to go through this procedure to whittle the numbers down.