Nothing but new window for any link to an aff program.
On my sites pages there are always a few attractive offers. If the visitor clicked a link to one program and signed up.. it will not be a problem for him to close the window with my site.. Moreover, the visitor might be very happy to find the great casino/promotion he/she just found and this may help another satisifed visitor to bookmark my site.
If the clicked link didn’t convert.. My site with the rest of the promotional offers and advertising is still in the background and has the potential to send the visitor to another program where the visitor may sign up.