When you boot an unattended Windows DVD(which contains autounattend.xml), you are directly taken to the installation routine.There is no option to launch the recovery environment.However I found a way of accessing Windows Recovery Environment from the unattended DVD.
Read it here *agnipulse.com/2009/11/recovery-environment-in-an-unattended-windows-dvd/
Read it here *agnipulse.com/2009/11/recovery-environment-in-an-unattended-windows-dvd/