You can access your account history, connected devices and access log in "Account settings" (wrench icon in the upper right corner) - "Security".
All your GateHub account actions starting with account creation are listed here.
All the devices that have logged into your account are listed here. You can remove a device from this list so it can not log into your account without being authorized again.
This is useful if you are signing in from a public computer and want to un-authorize it after you have stopped using it.
Your most recent logins are listed here. This can be used to determine when any potential unauthorized access was made.