WSUser in workflow

I'm trying to call a FormUtil method (addApprover on ObjectGroup to automatically set certain users as approvers as they're created) but this method requires access to the WSUser object. I can't seem to find a way to access the WSUser object from within the workflow. Can someone provide me with some direction?

[321 byte] By [ca_cudmore] at [2007-11-26 9:19:47]