i,ve not used tags, but done something similar for totals.
if in your browse you get the total to a sessionvalue. Then on your netwebform you can get to your embedded browse referenced as a field and then reset the things(yourtotalfield) on your form (send to server, servercode etc) - when the browse is clicked.
(its been a while and i recall i had to add some additional code to ensure it was acurate in all circumstances)