Collaborative filtering is a method whereby ____ are made about one user's interests by collecting and analyzing data from many users.

The first row in a data source, containing field names, is called the:

A) merge field. B) filter. C) header row. D) record.

Mac users can set up their computers to run both Windows and Mac OS X and select the platform they want to work with when they boot their computers.  This is called dual ______.?

Fill in the blank(s) with the appropriate word(s).