Task Sequence boots to logon screen instead of task sequence mode

sccmsccm-2012

I'm running a task sequence, and so that users don't accidentally interfere, I have the task sequence reboot to currently installed operating system, which as I understand, is supposed to boot to a sort of single user mode and all that shows is task sequence progress. However, this does not happen, it boots up like normal and comes to the logon screen and the task sequence runs in background. How can I adjust this behavior to the desired result?
Edit: to clarify, this is the sort of screen I want my users to see rather than the Ctrl+Alt+Del sign-in screen
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Best Answer

Ok, I found how this is done in those other task sequences, and its an effort I don't wish to duplicate. Reading the scripts these others specify, it runs off an auto logon and then other scripts to set the environment. Far too much effort for this simple project. Thank you to everyone who responded on this though.