Scrapebox Poster Question

When using the comment poster on Scrapebox, does it post via different browsers? I sometimes create backlinks via Firefox using a proxy but how does Scrapebox do this?
What exactly do the search engines see when links are built via Scrapebox?
Is there any advantage to creating my blog comments/backlinks all from Firefox using different proxies in the browser compared to using different proxies in Scrapebox?