1) you can set up field behavior on this layout so that only the check box field permits access in browser mode. There's a check box for this in the Inspector's data tab.
2) Clicking a button instead of that check box, can perform a script that appends the primary key field's value to a list of such selected values in either a global field or a global variable. A scripted find or a relationship (if using the Global field option) can then be used to pull up a found set of the selected records. This second method also keeps the selections made by one user from being visible or interfering with the selections made by another user.
And clicking the button the first time can add the ID number to the list while clicking it a second time removes it--just like clicking a check box.
Many thanks, that was just what I needed
Is there a script to do item 2 in your answer