I’d like to leave you a comment about a software program that may interest you for when you are collaborating online: Mikogo. This is a free desktop sharing tool. This could be something that you (or anyone) can use to present your desktop to your study participants live over the Web. I think you already have experience in organizing online meetings, however Mikogo’s benefit is that it is very easy to use and it’s free.
Participants just click on Join Meeting from the Mikogo homepage, open the software, enter the ID, and join your meeting. Also there are no configurations or network changes required to use Mikogo.
As an example, here is a message from a Mikogo user this week on our Forum: Mikogo Forum
Btw, you’ll also find further info on Mikogo in the forum.

Regards,

Andrew Donnelly
The Mikogo Team