Unless they are putting some sort of id number in each time they enter the data (that is the same each time they put it in), it would be hard to find a duplicate. If they are, then just search for that value, and tell the user that the information is being processed.

>I have a table that collects multi-user inputs for processing. Sometimes the processing isn't as fast as the user thinks it should be and submitts the request again. This causes the process problems. Before the process starts how can I go through the table and clean out any first duplicate entries?