1) Display Cover: The plastic cover that is on the opposite side of the LCD screen. Sometimes referred to as Top Cover.
Display Assembly is removed from laptop first, then LCD screen assembly is removed from the Display Cover.
2) Base Enclosure: The plastic bottom part of the notebook.
A laptop is disassembled from the Top down to the Bottom.
The bottom 'cover' (Base Enclosure) is not removed first. It is last.
3) There is no back cover per se. Half of the cover for the back (Bottom half) is part of the Base Enclosure. The top half is part of the Palm Rest.
(The back has the Vent in it)http://www.insidemylaptop.com/remove-replace-lcd-screen-inverter-hp-pavilion-dv6000-laptop/
[Use the dv6700 service manual. Go down to the subheading HP Pavilion dm1 (dm1 is in blue)
Scroll to the right, click on dv6700. Note that it is a PDF file, and may take up to 30 seconds, before you see the first page come up ]
What is it you are trying to do? What hardware component are you trying to access?
Post back in a Comment.
Display assembly is removed. Palm Rest Cover is removed, and so on.