On this page we explain how to record a session in OpenSim.

RECORDER
There is no record option in any OpenSim viewer (yet) so you need extra software to run besides your viewer.

The best free recorder for Windows is the BB Flashback Express recorder. You can find this recorder at: http://www.bbsoftware.co.uk/bbflashbackexpress.aspx

Install the recorder and start it, then start the OpenSim viewer.