How do you know whether your "Gmail" is open from elsewhere

To find out whether the account in "beautiful" is open from elsewhere, all you have to do is the open account in "Gmail" Then I go to the bottom of the list of messages, then click on
Details

Will open a new window containing information about the activity of many different devices in your account.

In this window will show you
In the box "Access Type" type of access, whether on the Web browser's phone or laptop.
In the box "Locaition IP Address" the IP address of who scored it in to your account.
In the box "Date Times" the time that you are logged in and the duration of its stay inside the account.
In case you notice any activity not related to you do, you must change the password on your account.