security - Group Policy: Administrator Rights for Specific Users on Specific Computers

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I'm a programmer stuck trying to
administer an Active Directory setup for a small company. The Domain Controller is
running Windows Small Business Server 2008.

We
have a staff of field workers using tablet PC's; configuration problems with the
tablet's ThinkVantage bloatware will require these users to have Administrator right
when using the tablets. That's alright – it's useful for them to have broad privileges
when I'm walking them through a fix over the phone, so I'm not looking for a work-around
there.

I would like to use Group
Policy to set up the following scenario: The users in a particular security group (or
organization unit) should be in the BUILTIN/Administrators group when logged in to
computers in a certain security group (or organization unit). It's okay if the computers
have to be in an OU, but I'd prefer to assign users by
group.

Of course, the field workers shouldn't be
Administrators on other workstations, and vanilla office staff shouldn't be Admins on
the tablets.

Currently, this is being managed
locally on each tablet, but as we add new hires, it's becoming more of a
hassle.

I feel like Restricted Groups is the
answer here, but without a solid grounding in AD concepts and methods, I'm having a hard
time making it happen.

What is the proper
technique for this task, and how would I go about implementing
it?

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class="normal">Answer

Create a
group to encapsulate the users (Local-Admins-Tablets) and add them to this
group

Create a sub-OU of the current
workstations OU and put the tablets in here
(Workstations\Tablets)

Create a GPO
(Local-Admins-Tablets-Policy) and link it to the Workstations\Tablets
OU

In the GPO, set the
following:

• Comp
  Config - Policies - Windows Settings - Security Settings - Restricted
  Groups


• Right click, Add
  Group


• "Administrators",
  OK


• Members of this Group:
  myDomain\Local-Admins-Tablets

Reboot
the PCs, and done.

Bear in mind that setting
Restricted Groups will overwrite the machines existing list of local Administrators. If
you have other users/groups in there already, you will need to add them to this policy
too. Other examples would be myDomain\Domain Admins
etc

EDIT: Oh, and change the
filtering on the GPO and add Domain Computers. The easiest way to
do this is to use the Group Policy Management MMC snapin (you can get this from the
href="http://www.google.ca/search?hl=en&safe=off&rlz=1C1GGLS_enCA291CA303&q=remote+server+administration+tool&btnG=Search&meta=&aq=f&oq="
rel="noreferrer">Remote Server Administration Tools from
Microsoft)