The high compliance instance of Aconex allows you to log in to Aconex on two different devices or browsers at the same time. In technical terms this is known as having two separate login sessions at the same time.
If you try to log in a third time, you will see a message that you are already logged in on two different devices or browsers. You must logout of Aconex to make a login session available. To do this click your name on the top right and click Logout.
If you close your web browser without clicking the logout button, you will need to wait up to 15 minutes for the login session to close on its own. Once the login session has closed, you will be able to log in again.