Google Hangout is an excellent service that enables both one-on-one and group chats with up to ten people at a time.
Google Hangouts are not all video based.
You can hold a hangout using only the textual chat functionality or you can add voice.
There is also another great feature called hangout on Air.
A Hangout on the Air is a Google hangout that is broadcast both on YouTube both through your Google+ page .
It’s a great way to have a “public” event or get more people involved in the conversation!
Take the time to see the video if you need a tool to support and/or teach Filemaker for your clients (19'24")