DAT Products allow only one user session at a time. If the username/email and password have been shared with another user, you will be logged out of the website upon them logging in.
Note: You are allowed to log into both the website and DAT One Mobile at the same time with a username/email and password.
For DAT Terms and Conditions, please click HERE
If you would like a second user to be able to access DAT as the same time, you will need to purchase an additional user license from DAT.