Synnefo

def create_user(request, form=None, backend=None, template_name='im/login.html', extra_context={}): 

    try:

        if not backend:

            backend = get_backend(request)

        if not form:

            form = backend.get_signup_form()

        if form.is_valid():

            status, message = backend.signup(form)

            messages.add_message(request, status, message)

        else:

            messages.add_message(request, messages.ERROR, form.errors)

    except (Invitation.DoesNotExist, ValueError), e:

        messages.add_message(request, messages.ERROR, e)

    #delete cookie

    return render_response(template_name,

                           form = LocalUserCreationForm(),

                           context_instance=get_context(request, extra_context))