As a vendor partner, you now have a full profile for candidates that you submitted. From there you can review your submission similar to how the prime vendor sees it. Also, you can now send messages from within Gustav and are not required to reply via email.
You can get to a candidate profile by clicking on
Engaged jobs in Gustav -> select the job to which you submitted the candidate -> click on
Submitted candidates in the top menu -> finally you need to click on a candidate's name to open the profile.