The Process Fields (from custom object library) contains several fields such as AWS_STATUS, AWS_ACTION, AWS_TASKID etc.
Why don't I find any values in these fields?? I can see only the AWS_ASSIGNED_ID field with the OID of the user being opened the form.
Why workspace doesn't set these values??
as far as AWS_ACTION is concerned - I think this is a dropdown list which contains a list of all the options the respective user should have when it comes to submitting the form. The list is populated at runtime from a comma-separated list which is stored on the server in one of the other process fields (there's a script that populates the list in the form). For every item, the Workspace app generates a button for the user to click on.
Regarding AWS_ASSIGNED_ID, I think this contains the user id of the guy who actually locked and edited the respective task.
I know this is not a complete answer, but maybe it helps.
Since you mentioned AWS_ACTION etc. in your post I thought I should provide some info ... but maybe that was a misunderstanding.
For the other two, I can only suspect that those are not at all relevant for the *form* itself. I guess they are just meant to be containers for values that the Workspace app uses to store values in (user abc has just submitted data, dear server - deal with it ). The data is then used to fill all the structures and values that you can use in your server side submit services, for example.