The server keeps track of when a server variable is created and updated. You see those columns in the server variables grid. A few customers wanted to see those values displayed on their user interfaces. If the checkbox is checked then for every server variable change event the client will not only be informed that the server variable changed it will also get two additional variables with the create and update date and times. Since this generates a lot more traffic to the clients it is disabled by default. Very few people need to see that data on the interfaces.