Question : Applying GPOs only to certain users on certain computers

Maybe this is a simple question, maybe not.  

How can I go about creating and implementing a GPO such that it employs user policy, but only applies the user policy on certain computers.

i.e.
I have User1 and User2 and Workstation1 and Workstation2.  I want to create a GPO that causes My Documents folder redirection (a User configuration for a GPO) for User1 and User2, but I ONLY want this GPO applied to Workstation1.  On Workstation2, both users should log in and access the local My Documents folder.

Thanks.

Answer : Applying GPOs only to certain users on certain computers

That's right - unless you apply loopback policy on that gpo - did you read my link?
Contained in the link:
"""Group Policy applies to the user or computer in a manner that depends on where both the user and the computer objects are located in Active Directory. However, in some cases, users may need policy applied to them based on the location of the computer object alone. ""

You can use the Group Policy loopback feature to apply Group Policy Objects (GPOs) that depend only on which computer the user logs on to."""