Hi Steady_Ed,
To achieve this, you can configure a group policy and then apply it to all the lab computers.
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1. Create a group policy on your Domain Controller.
2. Locate: Computer Configuration\Windows Settings\Security Settings\Software Restriction Policies\Additional Rules
3. Right click the blank space and then choose “New Hash Rule”.
4. Locate the SteadyState program: C:\Program Files\Windows SteadyState\SCTUI.exe. Configure Security Level as Disallowed and click OK.
5. Link the group policy to the lab computer OU.
To keep this policy from applying to domain admins, you can refer to the following article to change the permissions of the policy.
How To Keep Domain Group Policies from Applying to Administrator
http://support.microsoft.com/?id=315675
In addition, when configuring WDP, please also select “Don not warn the administrator about losing changes before log off, restart, or shut down” option. This option will disable the WDP warning message when administrators log off, restart, or shut down.
Best Regards,