There's not really a great way of tracking that you watched or "paid attention" to everything in all the VoDs. The assessment exams really indicate whether progress is or is not happening.
As for the multiple machines, I BELIEVE that the license allows two machines to register.
I have forwarded this on for verification though.
Paul, you are permitted 2 licenses for 2 different PC's . The workbook can be printed out, but we have a limitation of 2 on the number of prints due to DRM limits. The retake option is focused on your taking and completing the graded labs and scoring at least 80% or better on at least one before taking your actual CCIE exam. If you meet that criteria and take and fail your first attempt we will give you a second chane voucher at no cost to you, other than any local taxes that may or may not apply. The lessons on demand are not 'required' to be completed before taking your exam, but of course they will be beneficial if you go through the areas you need some additional focus. hope this helps, rick