The HPLD catalog is able to save previously checked out items from our catalog. To enable it, as its default states is "disabled", you will need to log into your account, select the Reading History tab on the left hand side of the screen, and click the button for "Save Reading History."
This will save all items checked out from that point on. It will not remember items previous to it being turned on. To disable this feature, go to the same location and click the button for "Opt Out."