This is from Harvardís NPC:
* Unmarried / Divorced / Separated: Each parent's contribution is assessed separately. Each parent should use the calculator to obtain an estimated cost for their personal income and asset information. The total estimated net price to attend Harvard is the sum of the estimates of the two parents.
* Remarried: Remarried parents should separate their income and assets from the applicant's step-parent's income and assets. For assets where a clear separation isn't obvious, please halve the value of these assets and include this value.
Gotta run, but I'll log on to collegboard later to look at Duke's again - it was something similar. I almost missed it as it was in the fine print on the right.