What exactly do you mean in a new tab? Do you mean when one form comes into another form, the "other form" gets open in a new tab?
I don't think it would bust anything... you can probably get it working by using some custom javascript. I'll play around with it and see if I can get it working.
EDIT: I'm so, so close. I added a custom JS event to the onclick of the button on my 1st form... the JS is
window.open(window.location.href, '_blank');
Problem is, it opens up the 1st web form again before opening up the 2nd form (after another click)