Dr. Mike Prince defines active learning in a lecture as any activity, related to the lesson, other than listening to the professor or writing notes. I have used several active learning tools in my lectures based on Project Catalyst and the ASEE NETI Workshop. 

However, I find that new and simple techniques are needed for an online lecture. Here is my very simple attempt to achieve active learning (according to the definition above) while offering an online lecture.

As students are watching a short lecture about units and, hopefully, writing notes, a series of questions are provided to them in eLearning. These questions are in a local html form, which is located directly under the online lecture (in the same window). The answers do not feed into the grade book or any other record. The questions are for one purpose and one purpose only. They give those watching a recorded lecture a check-list of items that should be highlighted in the short lecture.

I am working on a little project to automate generating the code behind this form so we do not spend an eternity writing HTML code and testing it in "student view" for every video recording.