reading workflow target object properties in powershell script

Hello,

I need some help with reading target user's property into a script from workflow. I have created undeprovision workflow. When user is un deprovision, I added Update task to update few attributes. Also, I call powershell script. In the powershell script, I would like to get following information from the workflow.

1. Target user's DN or Doamin\samaccountname

2. Initiator's DN or domain\samaccountname

3. Target user's other properties such as custom virtual attribute, name, display name etc..

Thanks.