In Workflow Manager 1.0, how can I access value of Workflow 'Out' argument from the client?

Question

This article describes how to read Out arguments of a Workflow, but when using Workflow Manager 1.0, you don't have access to the workflow running in a host:

• http://blogs.msdn.com/b/rjacobs/archive/2009/09/24/wf4-how-to-access-out-arguments.aspx

I have read the following documents about Workflow Manager 1.0

• Developers Introduction to Windows Workflow 1.0
• Workflow Manager 1.0 Tutorial
• How to create a Workflow for Workflow Manager 1.0
• What is Workflow Manager 1.0
• Installing and configuring Workflow Manager 1.0

I have downloaded and dissected he sample code provided by microsoft, but the information I need is not included.

• Workflow Manager 1.0 Samples

All the samples appear to return values using

WorkflowInstance.UserStatus

and set this using a SetUserStatus activity in the workflow, which isn't much use if you want to read the value of an Out argument defined in the workflow itself.