There are many types of webinar services available.
They do have a free 30 day trial and then the price is about 99.99 a month.
This can be a pricey investment but it can help an instructor give a demonstration and it can allow visitors to log in from the comfort of their homes.
When you register for a planned webinar, the general rule is to fill out a form. Once the form is complete you will receive a follow-up email with instructions on how to log in. The key is to save the email and mark your calendar so you will remember the date of the webinar. This log in link will be unique to you and it will not work for others. It is coded with your special log in information which will let the instructor know that you did indeed log into the webinar.
The second style of log-in is an instant webinar. This means the instructor would scheduled a webinar right now and then issue a link to instantly log in without filling out a form or pre-registering ahead of time.
Either style is ok to use. The Go To Webinar service is safe, secure and will not harm your computer.
I personally conduct webinars teaching eBay and online marketing once a week. I am teaching one right now while I type this guide!
The next time someone invites you to attend a webinar, you can now see how easy it is to log in!