Difficult to know more without more details about what are going on. We need to know where the rest of the data that you are displayed is stored. Here are three possibilities that I can think of.

1. You're displaying data that is stored in a database. Then make the values of the 'disp' checkboxes the primary key of the database rows. Only select and display the IDs that have been chosen.
2. You're displaying data that is stored in a text file. Then make the values of the 'disp' checkboxes the row number in the text file. Only display the data from the chosen rows.
3. You're displaying data that is input on the form. Then you need to name the input fields in some way based on the values in the 'disp' checkboxes so that you can access the data that you want to display.