Ravi, so it seems you mean when a guest access the SDM url you want it open the guest home page WITHOUT
click on "Guest login..." link? In that case, some how you would need to run this java script javascript:pdm_submit("login", "LogAsGuest")
and as far as I know, web browser(for example chrome) will not let you run a java script directly in the url so somhow
you still need to click something(a bookmarklet with this java script function?) and in that case, why not just let the guest
click on the "Guest login..." link on the page? Thanks _Chi