Yes, that's it Watdaflip,

Like in the phpmyadmin after You check the box You have then below some buttons where You can decide to edit, delete, etc make, an operation to the chosen line.

On a table, to make a link is very easy because You add the customer number to the link, such as: edit_client.php?client=$client_number, right?

But for a checked box how do I know the customer number ?

Thanks for replying,
pipesportugal