Get current user and session in a process template

Hi:

I am new in this Savvion platform, and i am developing a new process template to be deployed to the bpm portal, part of the requirements need that i have the current user, loged into the portal, then handle a session for this, my guess is that portal already must have an object or a variable from where i can get the current user and also have a live session object, for the user i tried using bizSite.getCurrentUser() but this only works for bizsolo apps, can anyone tell me how to get the user in a process template?