We will be using ESNet's Collaboration Service (ECS) to share applications during our meetings.
To attend as a guest, connect to http://www.ecs.es.net/
You should be greeted by the following panel of options:

Select the "Audio & Data" button, which brings you to the following page:

Select "Schedule or Attend Audio/Data Conference".
On the next page,

please type in the meeting ID in the bar at the top and select "Attend Meeting".

ESnet will now check your browser settings and install the necessary software. You should be able to simply follow the prompts. You may see the following screen; simply click yes.

Finally you will be in the meeting: