JSI Tip 1107. Using RUNONCE during unattended setup.

If you configure entries in the RUNONCE key during unattended setup, these items will run as soon as Rundll.exe is executed, regardless of wether a logon is in progress.

You must not add items to the RUNONCE key until after all Rundll.exe statements are invoked.

See the Windows NT 4.0 Deployment Guide, which is valid for both Server and Workstation.