when you have created your configuration in ICE, you might want to burn it to disk, to do this, from the tools menu, hover over “Create Media” then click “Create IBW image from answer file”.
this will then create a folder with all the things needed to create a disk.
to create the disk, you can either follow the guide http://www.windowsvalley.com/how-to-create-windows-7-bootable-dvd-using-nero/
or open the windows PE command prompt and use the tool oscdimg.
e.g. oscdimg -n -bc:\WindowsEmbeddedMediaShare\BOOT\ETFSBOOT.COM C:\WindowsEmbeddedMediaShare
some other neat tricks can be found in the pdf: http://www.intervalzero.com/pdfs/MiniTutorial_RTX_WES7_ICE.pdf