Giving user admin access to only 1 workstation?

I would like to give a user admin access to one specific workstation, but
regular access to all other workstations.

For example I want user John to have admin access to CPU1, but regular
access to all other CPU's.


I have a user policy package that has the appropriate group policy and DLU
policy associated to John. The DLU has Enable Login Restrictions and
inlcludes just CPU1.


When John logs in to CPU1 he becomes a member of the local administrators
and the appropriate group policy is placed in effect.

If a regular user logs into CPU1 they receive our standard group policy and
become members of the local users group.

However, if John logs into a different computer, say CPU2 he does not get
any DLU created. In this situation, I would like John treated like our
regular uses and a local user created that has only regular user rights

Any ideas?

Thanks