No, they cannot be a part of it. People who are not a part of Gmail cannot be a part of Google groups. It is the copyright of Gmail to be a part of it.
The list of groups on Gmail is not public. The groups are created by individuals. They might contain some private information as well.
You can make forms via Google forms. It is not included inside Gmail service. However, the same credentials goes into form as gmail.
The themes are included inside the Gmail website. They are for making the webpage more interesting. A person can select the theme which interests him/her.
Chatting on Gmail is done through their IM. The name of IM of Google is Google Hangouts. It can be used for chatting to friends or groups.
Name the groups which are included in contingency plan?
You can't send mass mails from Gmail, use googlegroups or something similar
You cannot download it to Google docs. You have to download it to your system first. After that you could upload it to the docs.
To group chat, when you are chatting with someone, press "options". Also, there is a button that says "group chat". Then you type in the third persons' gmail address.
If you have a gmail account, look into using Google Voice for this.
To delete a contact group:Click Contacts on the left side of any page.Select the contact group from the groups list.Click Delete Group at the top of the page.Click OK.For further information, reference GMail help at the related link below.
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