Pulling AD profile attribute (or connecting many users to diffrent portals)

hi

we've just upgrded to fortigate 201e and we want remote users to be able to connect to their local machine via vpn web portal. 

on our old rdp machine (juniper sa-2500) we've set a portal that pulled thier "webpage" attribute from AD and used it to connect to their machine (offcourse we've updated the webpage attribute in ad with the relevnt ip address). 

is there any way to create a portal that'll pull users ip and rdp to that ip? or any better way to do it? otherwise i'll have to create a portal for each user and that's a pain.

thanks.